Provide option in attrs.define to allow users to exclude parameters set to default value from `repr` #969

Job	Run time
Build docs & run doctests	16s
Tests & Mypy on 3.7	37s
Check types using pyright	16s
Tests & Mypy on 3.8	46s
Tests & Mypy on 3.9	59s
Verify dev env (ubuntu-latest)	21s
Tests & Mypy on 3.10	1m 4s
Verify dev env (windows-latest)	48s
Tests & Mypy on 3.11	48s
Tests & Mypy on 3.12	1m 6s
Tests & Mypy on 3.13	47s
Tests & Mypy on pypy-3.8	49s
Tests & Mypy on pypy-3.9	45s
Tests & Mypy on pypy-3.10	50s
Combine & check coverage.	8s
required-checks-pass	2s
	10m 22s

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