ci: Add pre-commit

[xdustinface]

This PR adds https://pre-commit.com to the project which is a framework that runs automated checks on your code before you commit or push to help catching issues before they hit the CI. The same checks will also run in the CI via the integrated pre-commit github workflow.

This should be reviewed commit by commit since its pretty big PR mainly because of c422499 which fixes 2000 lines of trailing whitespaces. The first commit introduces all the infrastructure, the second cleans up all the github workflow steps which are now consolidated in the pre-commit config and the other commits just fix up one pre-commit stage per commit to get all of them to pass.

With pre commit hooks installed

See https://github.com/dashpay/rust-dashcore/blob/3543d2386f1385d1cf62d1fcf9863c94553f1356/CONTRIBUTING.md#pre-commit-hooks

When commiting:

• The code gets formatted (cargo fmt, line endings fixed)
• Typos get corrected
• Basic file checks run (yaml syntax, trailing whitespace, etc.)
• Takes a few seconds

When pushing:

• Clippy runs on the whole workspace
• FFI headers and docs get verified (regenerated and checked for drift)
• Takes probably up to 60 seconds depending on what changed but generally it should not be too slow.

If something fails, the commit/push is blocked and you'll see what needs fixing while most things get auto generated via the check run.

[coderabbitai]

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ci/pre-commit

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