feat: implement command to convert currencies

[HeadTriXz]

Adds a command to easily convert currencies.

[codecov]

Codecov Report

Attention: 29 lines in your changes are missing coverage. Please review.

Comparison is base (e57eea4) 98.98% compared to head (778e063) 98.86%.

Files	Patch %	Lines
...odules/general/commands/chatinput/convert/index.ts	0.00%	29 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #98      +/-   ##
==========================================
- Coverage   98.98%   98.86%   -0.13%     
==========================================
  Files         198      200       +2     
  Lines       21459    21732     +273     
  Branches     2366     2384      +18     
==========================================
+ Hits        21241    21485     +244     
- Misses        216      245      +29     
  Partials        2        2              

Flag	Coverage Δ
barry	98.59% <89.37%> (-0.15%)	⬇️
core	99.92% <ø> (ø)
logger	100.00% <ø> (ø)

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