refactor: use eslint-config-neon for packages.

[suneettipirneni]

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

Adds and conforms to eslint-config-neon

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

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1 Ignored Deployment

Name	Status	Preview	Updated
discord-js	⬜️ Ignored (Inspect)		Sep 1, 2022 at 6:39PM (UTC)

[codecov]

Codecov Report

Merging #8579 (4dca8f8) into main (4bdb059) will decrease coverage by 0.05%.
The diff coverage is 87.91%.

@@            Coverage Diff             @@
##             main    #8579      +/-   ##
==========================================
- Coverage   86.43%   86.37%   -0.06%     
==========================================
  Files          87       87              
  Lines        8550     8647      +97     
  Branches     1105     1107       +2     
==========================================
+ Hits         7390     7469      +79     
- Misses       1117     1136      +19     
+ Partials       43       42       -1     

Flag	Coverage Δ
builders	100.00% <100.00%> (ø)
collection	100.00% <100.00%> (ø)
proxy	74.10% <75.00%> (+0.81%)	⬆️
rest	91.96% <89.13%> (+0.07%)	⬆️
utilities	100.00% <100.00%> (ø)
voice	63.86% <45.09%> (-0.22%)	⬇️
ws	60.57% <85.08%> (+0.34%)	⬆️

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

Impacted Files	Coverage Δ
packages/proxy/src/util/responseHelpers.ts	90.16% <0.00%> (ø)
packages/proxy/src/util/util.ts	0.00% <0.00%> (ø)
packages/rest/src/lib/handlers/IHandler.ts	0.00% <0.00%> (ø)
packages/voice/src/audio/AudioPlayerError.ts	0.00% <ø> (ø)
packages/voice/src/audio/AudioResource.ts	95.23% <ø> (ø)
packages/voice/src/audio/PlayerSubscription.ts	50.00% <ø> (ø)
packages/voice/src/networking/VoiceWebSocket.ts	0.00% <0.00%> (ø)
packages/voice/src/receive/SSRCMap.ts	86.20% <ø> (ø)
packages/voice/src/receive/SpeakingMap.ts	100.00% <ø> (ø)
packages/voice/src/receive/VoiceReceiver.ts	90.56% <ø> (ø)
... and 72 more

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[imranbarbhuiya]

these 4 changes needed. Else LGTM