feat(httpApi): external authorizer

[Michsior14]

This allows to add external authorizer to httpApi event in similar manner to http event.

Closes: #7598

[codecov-commenter]

Codecov Report

Merging #7789 into master will increase coverage by 0.08%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #7789      +/-   ##
==========================================
+ Coverage   88.13%   88.21%   +0.08%     
==========================================
  Files         245      245              
  Lines        9262     9300      +38     
==========================================
+ Hits         8163     8204      +41     
+ Misses       1099     1096       -3     

Impacted Files	Coverage Δ
...lugins/aws/package/compile/events/httpApi/index.js	90.11% <100.00%> (+1.63%)	⬆️
lib/utils/log/log.js	0.00% <0.00%> (ø)
lib/utils/getServerlessConfigFile.js	100.00% <0.00%> (ø)
lib/classes/Utils.js	95.33% <0.00%> (+0.06%)	⬆️
...s/package/compile/events/apiGateway/lib/apiKeys.js	94.73% <0.00%> (+0.14%)	⬆️
.../compile/events/apiGateway/lib/hack/updateStage.js	95.12% <0.00%> (+0.15%)	⬆️

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[medikoo]

@Michsior14 great thanks for giving that a spin.

Still, in first place we need to agree on an implementation in scope of an issue (#7598).

There was already an implementation spec proposed there.

[medikoo]

Thank you @Michsior14 It looks really good! I’ve proposed few last minor improvements and we should be good to go

[medikoo]

@Michsior14 looks great! Posted just one final suggestion, to keep in-logic validation simpler, and we should be good to go

[medikoo]

Thank you @Michsior14 !