feat: implement add note command

[HeadTriXz]

Part of #23.

• Adds a /cases notes add command.

[codecov]

Codecov Report

Patch coverage: 69.60% and project coverage change: -0.26% ⚠️

Comparison is base (2f476e6) 99.13% compared to head (79325fd) 98.87%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #70      +/-   ##
==========================================
- Coverage   99.13%   98.87%   -0.26%     
==========================================
  Files         117      119       +2     
  Lines       13755    13879     +124     
  Branches     1455     1462       +7     
==========================================
+ Hits        13636    13723      +87     
- Misses        119      156      +37     

Flag	Coverage Δ
barry	98.40% <69.60%> (-0.37%)	⬇️
core	99.92% <ø> (ø)
logger	100.00% <ø> (ø)

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

Files Changed	Coverage Δ
...dules/moderation/commands/chatinput/cases/index.ts	0.00% <0.00%> (ø)
...moderation/commands/chatinput/cases/notes/index.ts	0.00% <0.00%> (ø)
...ration/commands/chatinput/cases/notes/add/index.ts	100.00% <100.00%> (ø)

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