Add new provider for `hgnc.symbol`: `g2p` #4726

Job	Run time
Documentation (3.12)	44s
Tests (ubuntu-latest, 3.12, pydantic1)	14m 54s
Tests (ubuntu-latest, 3.12, pydantic2)	14m 34s
Code Quality (3.12, manifest)	53s
Tests (ubuntu-latest, 3.9, pydantic2)	11m 25s
Code Quality (3.12, lint)	18s
Tests (windows-latest, 3.12, pydantic2)	16m 46s
Code Quality (3.12, pyroma)	21s
Code Quality (3.12, mypy)	20s
Code Quality (3.9, manifest)	31s
Code Quality (3.9, lint)	24s
Code Quality (3.9, pyroma)	22s
Code Quality (3.9, mypy)	23s
	1h 1m 55s

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