fix: Add TypeVar("C") for decorators to maintain typing

[HCookie]

Address improper type hints on decorators primarily used for convenience on top of data accessors.

Adds

C = TypeVar("C")

in various places

Allows for type checkers and code editors to establish the init args of various classes.

[coveralls]

Pull Request Test Coverage Report for Build 19314687946

Details

• 12 of 13 (92.31%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.002%) to 61.528%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
packages/data/src/pyearthtools/data/indexes/decorators.py	3	4	75.0%

Totals
Change from base Build 19286124513:	0.002%
Covered Lines:	9636
Relevant Lines:	15246

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💛 - Coveralls

[tennlee]

Hey, awesome, thank you! Looks great!