Add exclude_computed_fields serialization option

[Viicos]

Change Summary

Following pydantic/pydantic-core#1780.

Fixes #7114.
Fixes #5827.

Related issue number

Checklist

• The pull request title is a good summary of the changes - it will be used in the changelog
• Unit tests for the changes exist
• Tests pass on CI
• Documentation reflects the changes where applicable
• My PR is ready to review, please add a comment including the phrase "please review" to assign reviewers

[github-actions]

Coverage report

This PR does not seem to contain any modification to coverable code.

[codspeed-hq]

CodSpeed Performance Report

Merging #12334 will improve performances by 6.59%

_{Comparing exclude-computed-fields (49b1df6) with main (9b939b2)}

Summary

⚡ 1 improvement
✅ 45 untouched

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	test_model_validators_serializers	813.8 µs	763.5 µs	+6.59%