feat: add --version flag

[waldo121]

Summary

Adds a cli --version flag

Related Issue

Closes #39

Type of Change

• Bug fix
• New feature
• Refactor
• Documentation update
• CLI behavior change

What Changed

List the key changes in a few bullets.

• Adds a cli --version flag
• Adds a unit test for that change
• Adds an entry in the cli reference documentation

Validation

• Run the new test that i have added in test_cli.py
• Rebuild and view the documentation

Checklist

• The code follows style conventions.
• I added unit tests for the new functionality.
• CI (GitHub Actions) is green.
• I updated documentation/README when needed.

Before/After Output (if applicable)

Include relevant CLI output snippets when behavior or formatting changed.

Before

oracletrace --version
usage: oracletrace [-h] [--json JSON] [--compare COMPARE] [--csv CSV] [--ignore REGEX [REGEX ...]] [--top NUMBER] [--fail-on-regression] [--threshold THRESHOLD] [--only-regressions]
                   target
oracletrace: error: the following arguments are required: target

After

oracletrace --version
oracletrace 2.0.1

[KaykCaputo]

Very nice, simple and concise, I will proceed with the merge.