Enum options

[Middledot]

Summary

Add support for Enums to be used for options as an alternative to listing options choices.

example:

class Perms(enums.Enum):
    """Choose permission"""
    admin = 0
    mod = 1
    member = 2

@bot.slash_command()
async def perms(ctx, option: Perms):
    await ctx.respond(option)  # gives an enum object

before:

@bot.slash_command()
async def perms(ctx, option: discord.Option(int, description="Choose permission", choices=[discord.OptionChoice("admin", 0), ...])):
    await ctx.respond(option)  # gives an interger

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why
• This PR fixes an issue.
• This PR adds something new (e.g. new method or parameters).
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, typehinting, examples, ...)

[VincentRPS]

You should add support for discord.Enum as well

[Lulalaby]

Amazing work @Middledot

[krittick]

Conflicts need to be resolved. Looks good otherwise.

[codecov]

Codecov Report

Merging #1292 (04151a0) into master (6913833) will decrease coverage by 0.02%.
The diff coverage is 12.50%.

@@            Coverage Diff             @@
##           master    #1292      +/-   ##
==========================================
- Coverage   33.50%   33.47%   -0.03%     
==========================================
  Files          93       93              
  Lines       17560    17581      +21     
==========================================
+ Hits         5883     5886       +3     
- Misses      11677    11695      +18     

Flag	Coverage Δ
pytest	33.47% <12.50%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
discord/commands/core.py	17.60% <6.25%> (-0.04%)	⬇️
discord/commands/options.py	16.21% <18.75%> (-0.28%)	⬇️

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