refactor: normalize compiler version handling

[banteg]

Stack

• Stacked on fix: repair pull request ci #2148 (feat/fix-pr-ci).
• Intended review diff while fix: repair pull request ci #2148 is open: feat/fix-pr-ci..feat/compiler-version-normalization.
• GitHub cannot use feat/fix-pr-ci as this upstream PR's base while that branch only exists in the fork, so the visible PR diff includes the stack until fix: repair pull request ci #2148 lands.
• Current CI failures are expected to be handled in the CI-fix stack, not in this versioning PR.

Summary

This PR separates Brownie's compiler version value type from pragma range parsing:

• Compiler version values now use packaging.version.Version, matching py-solc-x and vvm.
• Solidity pragmas and legacy Vyper # @version pragmas continue to use npm-style range grammar through semantic_version.NpmSpec.
• Modern Vyper pragmas use Vyper's current PEP 440 packaging.specifiers.SpecifierSet behavior.

That gives Brownie the same version object type as its compiler-manager dependencies without replacing Solidity/Vyper pragma syntax with PEP 440.

Details

• Adds brownie._versioning for compiler version normalization and language-specific pragma wrappers.
• Normalizes compiler-originated strings such as v0.8.20 and 0.8.20+commit... into packaging.version.Version.
• Keeps Solidity pragma extraction closer to solc behavior: comments and strings are ignored, multiple pragma solidity directives are intersected, and pragma solidityx; is not treated as a Solidity version pragma.
• Wraps NpmSpec for Solidity-specific input cleanup: operator spacing, quoted range tokens, adjacent operator splitting, rejection of v-prefixed Solidity literals, rejection of prerelease/build-qualified match expressions, and solc's wider ^0.0.patch behavior.
• Keeps legacy Vyper # @version matching on NpmSpec, including old prerelease spellings such as 0.1.0b16.
• Keeps modern Vyper #pragma version / # @version matching on SpecifierSet, including Vyper's leading ^ to ~= compatibility rewrite.
• Parses Vyper version pragmas from Python comment tokens so strings and unrelated pragmas such as #pragma optimize are ignored.
• Preserves already-installed compiler selection when the installable/available version list does not contain a matching compiler.

Compatibility Notes

• brownie.project.compiler.solidity.get_version() and brownie.project.compiler.vyper.get_version() now return packaging.version.Version.
• Downstream code that used semantic_version.Version conveniences such as .truncate(), .next_minor(), or .next_patch() on those return values should switch to packaging.Version properties/helpers.
• semantic-version remains a runtime dependency because Brownie still accepts npm-style Solidity and legacy Vyper pragma syntax.
• packaging is now a direct runtime dependency because Brownie imports it directly.
• install_solc("latest") is preserved and still forwards "latest" to py-solc-x.
• Duplicate Vyper version pragmas are rejected consistently with modern Vyper.

Generated Files

• The branch includes regenerated mypyc output under build/.
• For code review, the useful diff is the non-generated review diff: feat/fix-pr-ci..feat/compiler-version-normalization -- . ':!build/__native_eth_brownie.c' ':!build/__native_eth_brownie.h' ':!build/__native_internal_eth_brownie.h'.

Validation

• uv run --python /opt/homebrew/bin/python3.13 --with-requirements requirements.txt --with pytest-cov==2.10.1 --with eth-retry==0.3.5 python -m pytest tests/project/test_sources.py tests/project/compiler/test_utils.py tests/project/compiler/test_solidity.py -k 'not first_revert' -q
• uv run --python /opt/homebrew/bin/python3.13 --with-requirements requirements.txt --with pytest-cov==2.10.1 --with eth-retry==0.3.5 python -m pytest tests/project/compiler/test_vyper.py -k 'find_vyper_versions_uses_installed_when_available_list_does_not_match or set_vyper_version_normalizes_version_like_objects' -q
• uv run --isolated python -m py_compile brownie/_versioning.py brownie/project/sources.py brownie/project/compiler/solidity.py brownie/project/compiler/vyper.py tests/project/test_sources.py tests/project/compiler/test_solidity.py tests/project/compiler/test_vyper.py tests/project/compiler/test_utils.py
• uvx --from black==24.1.1 black --check brownie/_versioning.py brownie/project/sources.py brownie/project/compiler/solidity.py brownie/project/compiler/vyper.py tests/project/test_sources.py tests/project/compiler/test_solidity.py tests/project/compiler/test_vyper.py tests/project/compiler/test_utils.py
• uvx --from isort==5.13.2 isort --check-only --diff brownie/_versioning.py brownie/project/sources.py brownie/project/compiler/solidity.py brownie/project/compiler/vyper.py tests/project/test_sources.py tests/project/compiler/test_solidity.py tests/project/compiler/test_vyper.py tests/project/compiler/test_utils.py --skip brownie/__init__.py
• uvx --python /opt/homebrew/bin/python3.13 --from build python -m build --wheel
• git diff --check feat/fix-pr-ci..feat/compiler-version-normalization -- . ':!build/__native_eth_brownie.c'

Note: generated mypyc C output still contains generator-emitted trailing whitespace, so the whitespace check excludes the generated C artifact.