Feat/rank and file consts

[jacksonthall22]

Adds file/rank TypeAliases, constants, and functions to be consistent with those for SQUARES, BB_SQUARES/_RANKS/_FILES, etc.

For example, we could do this already:

  >>> chess.SQUARE_NAMES[chess.E4]
Out[1]: 'e4'

but had to key into files/ranks manually:

>>> chess.FILE_NAMES[4]
Out[2]: 'e'
>>> chess.RANK_NAMES[3]
Out[3]: '4'

now it's a little easier!

>>> chess.FILE_NAMES[chess.FILE_E]
Out[2]: 'e'
>>> chess.RANK_NAMES[chess.RANK_4]
Out[3]: '4'

[Mintas]

Hi!
Nice feature, would like to have this one too!

What about making it a bit more concise?

File: TypeAlias = int
FILES = [FILE_A, FILE_B, FILE_C, FILE_D, FILE_E, FILE_F, FILE_G, FILE_H] = range(8)

and the same for RANKS ?

[niklasf]

Thanks!

Merging as is, because in some IDEs the tooltips are nicer when the constants are explicitly defined like this.

[jacksonthall22]

Sweet, thanks for merging @niklasf!

in some IDEs the tooltips are nicer when the constants are explicitly defined like this

Agreed - mostly did like this because SQUARES is now defined the same way (relevant commit, cc @Mintas)