Add ScyllaDB license headers

[dkropachev]

Summary

• replace the abbreviated notice with the full Apache License 2.0
• add the ScyllaDB Apache header to all 48 JavaScript and TypeScript source/config files
• add a pinned ESLint 10-compatible license-header rule with autofix support

Testing

• npm run verify
• npm audit --omit=dev --audit-level=moderate
• service-backed integration suite in CI

Fixes: DRIVER-713
Fixes: #26
Epic: DRIVER-49

[Copilot]

Pull request overview

Adds standardized ScyllaDB Apache 2.0 licensing across the codebase, addressing issue #26 and DRIVER-713.

Changes:

• Replaces the abbreviated license with the full Apache 2.0 text.
• Adds consistent headers to all 48 JavaScript and TypeScript files.
• Enforces headers through a pinned, autofix-capable ESLint plugin.

Reviewed changes

Copilot reviewed 50 out of 51 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
LICENSE	Adds the complete Apache 2.0 license.
package.json	Adds the pinned license-header plugin.
package-lock.json	Locks the plugin and transitive dependency.
eslint.config.js	Configures header enforcement.
tsup.config.ts	Adds the license header.
vitest.config.ts	Adds the license header.
vitest.integration.config.ts	Adds the license header.
src/affinity.ts	Adds the license header.
src/body.ts	Adds the license header.
src/client-base.ts	Adds the license header.
src/client-edge.ts	Adds the license header.
src/client.ts	Adds the license header.
src/compression-edge.ts	Adds the license header.
src/compression-node.ts	Adds the license header.
src/compression-shared.ts	Adds the license header.
src/compression-types.ts	Adds the license header.
src/config.ts	Adds the license header.
src/discovery.ts	Adds the license header.
src/document-edge.ts	Adds the license header.
src/document.ts	Adds the license header.
src/edge.ts	Adds the license header.
src/index.ts	Adds the license header.
src/logger.ts	Adds the license header.
src/middleware.ts	Adds the license header.
src/murmur.ts	Adds the license header.
src/query-plan.ts	Adds the license header.
src/routing.ts	Adds the license header.
src/runtime-common.ts	Adds the license header.
src/runtime-edge.ts	Adds the license header.
src/runtime-node.ts	Adds the license header.
src/seeded-random.ts	Adds the license header.
src/types.ts	Adds the license header.
src/user-agent.ts	Adds the license header.
test/affinity.test.ts	Adds the license header.
test/config.test.ts	Adds the license header.
test/discovery.test.ts	Adds the license header.
test/document.test.ts	Adds the license header.
test/helpers.ts	Adds the license header.
test/middleware.test.ts	Adds the license header.
test/query-plan.test.ts	Adds the license header.
test/type-usage.test.ts	Adds the license header.
test/integration-test/alternator-client.test.ts	Adds the license header.
test/integration-test/config.ts	Adds the license header.
test/integration-test/dynamodb-operations.test.ts	Adds the license header.
test/integration-test/helpers.ts	Adds the license header.
test/integration-test/http-client-implementation.test.ts	Adds the license header.
test/integration-test/http-connection-reuse.test.ts	Adds the license header.
test/integration-test/key-route-affinity-autodiscovery.test.ts	Adds the license header.
test/integration-test/tls-config.test.ts	Adds the license header.
test/integration-test/tls-session-resumption.test.ts	Adds the license header.
test/integration-test/internal/connection-pool.test.ts	Adds the license header.

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