feat(GuildMemberManager): addRole and removeRole

[didinele]

Please describe the changes this PR makes and why it should be merged:
Supersedes #8400.

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)

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated
discord-js	✅ Ready (Inspect)	Visit Preview	Aug 18, 2022 at 7:10AM (UTC)

[codecov]

Codecov Report

Merging #8510 (af20d8d) into main (d97cd93) will decrease coverage by 3.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #8510      +/-   ##
==========================================
- Coverage   89.37%   86.29%   -3.09%     
==========================================
  Files          66       87      +21     
  Lines        7343     8363    +1020     
  Branches      899     1105     +206     
==========================================
+ Hits         6563     7217     +654     
- Misses        776     1103     +327     
- Partials        4       43      +39     

Flag	Coverage Δ
builders	100.00% <ø> (ø)
collection	100.00% <100.00%> (ø)
proxy	73.28% <ø> (ø)
rest	92.53% <ø> (ø)
utilities	100.00% <ø> (ø)
voice	64.08% <ø> (?)
ws	59.57% <100.00%> (+0.02%)	⬆️

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

Impacted Files	Coverage Δ
packages/collection/src/collection.ts	100.00% <100.00%> (ø)
packages/ws/src/utils/utils.ts	100.00% <100.00%> (ø)
packages/ws/src/ws/WebSocketManager.ts	95.62% <100.00%> (+0.01%)	⬆️
packages/voice/src/joinVoiceChannel.ts	100.00% <0.00%> (ø)
packages/voice/src/DataStore.ts	98.11% <0.00%> (ø)
packages/voice/src/audio/TransformerGraph.ts	74.60% <0.00%> (ø)
packages/voice/src/audio/PlayerSubscription.ts	50.00% <0.00%> (ø)
packages/voice/src/networking/Networking.ts	3.18% <0.00%> (ø)
packages/voice/src/receive/SSRCMap.ts	86.20% <0.00%> (ø)
packages/voice/src/util/abortAfter.ts	100.00% <0.00%> (ø)
... and 14 more

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more