feat: add linked roles formatters

[sdanialraza]

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

• Document linked roles message formatting discord/discord-api-docs#7105

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating
• This PR changes the library's interface (methods or parameters added)

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2 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.47%. Comparing base (4374374) to head (3dc3b51).
Report is 28 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10461      +/-   ##
==========================================
+ Coverage   35.45%   35.47%   +0.01%     
==========================================
  Files         228      228              
  Lines       14319    14323       +4     
  Branches     1254     1255       +1     
==========================================
+ Hits         5077     5081       +4     
  Misses       9198     9198              
  Partials       44       44              

Flag	Coverage Δ
builders	91.58% <ø> (ø)
formatters	97.47% <100.00%> (+0.03%)	⬆️

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