Cached store part #1: API

[levb]

This is a precursor PR for the cached store, it adds an API struct to pass around static API pointers, and makes it available in incoming.Request

[codecov-commenter]

Codecov Report

Patch coverage: 18.79% and project coverage change: +0.56 🎉

Comparison is base (8bfe37b) 20.31% compared to head (061a175) 20.88%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #457      +/-   ##
==========================================
+ Coverage   20.31%   20.88%   +0.56%     
==========================================
  Files          78       79       +1     
  Lines        5266     5416     +150     
==========================================
+ Hits         1070     1131      +61     
- Misses       4066     4153      +87     
- Partials      130      132       +2     

Impacted Files	Coverage Δ
apps/goapp/http.go	0.00% <0.00%> (ø)
server/config/service.go	0.00% <0.00%> (ø)
server/config/test_service.go	0.00% <0.00%> (ø)
server/proxy/enable.go	4.05% <0.00%> (-0.36%)	⬇️
server/proxy/expand_getter.go	0.00% <0.00%> (ø)
server/proxy/install.go	0.00% <0.00%> (ø)
server/proxy/invoke_oauth2.go	0.00% <0.00%> (ø)
server/proxy/invoke_static.go	18.91% <0.00%> (ø)
server/proxy/invoke_webhook.go	0.00% <0.00%> (ø)
server/proxy/notify.go	0.00% <0.00%> (ø)
... and 17 more

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[mattermost-build]

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