feat(bot): Add guildUnavailable event, fixes #3028

[AFink]

Better late than never!

[github-actions]

Benchmark

Detail results of benchmarks

Benchmark suite	Base (abfa0bb)	Latest Head (151cf59)	2b17097	8cc7483
[transformer] message cache check RSS	115.98 MB ±1%	117.48 MB ±1%	121.07 MB ±1%	117.13 MB ±1%
[transformer] message cache check Heap Used	117.5 MB ±1%	119.29 MB ±1%	116.54 MB ±1%	117.19 MB ±1%
[transformer] message cache check Heap Total	107.41 MB ±1%	106.09 MB ±1%	107.14 MB ±1%	106.88 MB ±1%
[transformer] old message cache check RSS	80.96 MB ±1%	76.54 MB ±1%		84.29 MB ±1%
[transformer] old message cache check Heap Used	101.67 MB ±1%	101.97 MB ±1%	101.24 MB ±1%	101.45 MB ±1%
[transformer] old message cache check Heap Total	80.67 MB ±1%	80.67 MB ±1%	80.4 MB ±1%	82.76 MB ±1%
[Cache Plugin] RSS	0.62 MB ±2.81%	0.61 MB ±2.87%	0.61 MB ±2.89%	0.68 MB ±3%
[Cache Plugin] Heap Used	10.67 MB ±1.44%	10.65 MB ±1.44%	10.73 MB ±1.44%	10.66 MB ±1.44%
[Cache Plugin] Heap Total	0 MB ±0%	0 MB ±0%	0 MB ±0%	0 MB ±0%
rest.simplifyUrl	218176 ops/sec ±0.33%	224502 ops/sec ±0.38%	225371 ops/sec ±0.25%	216886 ops/sec ±0.40%
Camelize 1 event	6212 ops/sec ±0.35%	6358 ops/sec ±0.28%	6514 ops/sec ±0.31%	6061 ops/sec ±0.32%
Snakelize 1 event	6225 ops/sec ±0.35%	6218 ops/sec ±0.32%	6486 ops/sec ±0.79%	5976 ops/sec ±0.36%

[codecov]

Codecov Report

Merging #3044 (151cf59) into main (abfa0bb) will decrease coverage by 0.02%.
The diff coverage is 25.00%.

@@            Coverage Diff             @@
##             main    #3044      +/-   ##
==========================================
- Coverage   79.03%   79.02%   -0.02%     
==========================================
  Files         181      181              
  Lines       19537    19541       +4     
  Branches      452      452              
==========================================
+ Hits        15441    15442       +1     
- Misses       4090     4093       +3     
  Partials        6        6              

Flag	Coverage Δ		*Carryforward flag
bot	54.38% <25.00%> (-0.02%)	⬇️	Carriedforward from 2b17097
bot-e2e	54.30% <ø> (ø)		Carriedforward from 2b17097
bot-unit	45.69% <25.00%> (-0.02%)	⬇️
discordeno	100.00% <ø> (ø)
discordeno-unit	100.00% <ø> (ø)
gateway	74.26% <ø> (ø)
gateway-integration	74.26% <ø> (ø)
gateway-unit	29.73% <ø> (ø)
rest	87.04% <ø> (ø)
rest-e2e	29.72% <ø> (ø)		Carriedforward from 2b17097
rest-unit	72.64% <ø> (ø)
types	100.00% <ø> (ø)
types-unit	100.00% <ø> (ø)
utils	97.73% <ø> (ø)
utils-unit	97.73% <ø> (ø)

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
packages/bot/src/handlers/guilds/GUILD_DELETE.ts	40.00% <0.00%> (-17.15%)	⬇️
packages/bot/src/bot.ts	91.82% <100.00%> (+0.03%)	⬆️