refactor(Emoji)!: make imageURL() changing extension dynamically

[Idris1401]

Please describe the changes this PR makes and why it should be merged:

I think it'd be better if Emoji#imageURL() changes the extension dynamically as others ...URL() functions.

Status and versioning classification:

• This PR includes breaking changes (methods removed or renamed, parameters moved or removed)

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Resolved.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.96%. Comparing base (9fea069) to head (e19f756).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10613   +/-   ##
=======================================
  Coverage   37.96%   37.96%           
=======================================
  Files         239      239           
  Lines       14877    14877           
  Branches     1377     1378    +1     
=======================================
  Hits         5648     5648           
  Misses       9218     9218           
  Partials       11       11           

Flag	Coverage Δ
proxy	64.63% <ø> (ø)
rest	87.47% <100.00%> (ø)
ws	34.45% <ø> (ø)

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[Idris1401]

idk if the docs/typings for BaseGuildEmoji#imageURL() should also be updated or no