feat(Webhook): add channel property

[MrMythicalYT]

Please describe the changes this PR makes and why it should be merged:
This PR adds a channel getter for webhooks
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 Ignored Deployments

Name	Status	Preview	Updated
discord-js	⬜️ Ignored (Inspect)		Nov 20, 2022 at 0:09AM (UTC)
discord-js-guide	⬜️ Ignored (Inspect)		Nov 20, 2022 at 0:09AM (UTC)

[codecov]

Codecov Report

Merging #8812 (ccb21bb) into main (b2658ce) will decrease coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #8812      +/-   ##
==========================================
- Coverage   85.81%   85.63%   -0.18%     
==========================================
  Files          91       96       +5     
  Lines        9254     9475     +221     
  Branches     1125     1137      +12     
==========================================
+ Hits         7941     8114     +173     
- Misses       1271     1319      +48     
  Partials       42       42              

Flag	Coverage Δ
brokers	65.24% <ø> (ø)
builders	98.65% <ø> (-1.35%)	⬇️
collection	100.00% <ø> (ø)
proxy	81.53% <ø> (ø)
rest	91.97% <ø> (-0.09%)	⬇️
util	100.00% <ø> (ø)
utilities	100.00% <ø> (ø)
voice	63.70% <ø> (ø)
ws	59.83% <ø> (ø)

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

Impacted Files	Coverage Δ
packages/builders/src/components/Components.ts	87.87% <0.00%> (-12.13%)	⬇️
packages/rest/src/lib/utils/utils.ts	97.33% <0.00%> (-0.48%)	⬇️
...ackages/rest/src/lib/handlers/SequentialHandler.ts	86.07% <0.00%> (-0.37%)	⬇️
packages/collection/src/collection.ts	100.00% <0.00%> (ø)
packages/builders/src/components/ActionRow.ts	100.00% <0.00%> (ø)
packages/builders/src/components/Assertions.ts	100.00% <0.00%> (ø)
...ders/src/components/selectMenu/SelectMenuOption.ts
...s/builders/src/components/selectMenu/SelectMenu.ts
...ilders/src/components/selectMenu/BaseSelectMenu.ts	92.18% <0.00%> (ø)
...ilders/src/components/selectMenu/RoleSelectMenu.ts	90.32% <0.00%> (ø)
... and 5 more

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[jaw0r3k]

Can you format it? yarn format
as djs uses different syntax

[kyranet]

Just minor nits