New endpoint returning all rule IDs

[joselsegura]

Description

Adding a /rules endpoint to retrieve the list of rule IDs. It also checks the organization ID to retrieve only external rules or include the internal ones too

Type of change

• New feature (non-breaking change which adds functionality)

Testing steps

regular CI

[codecov-commenter]

Codecov Report

Merging #137 into master will increase coverage by 1.78%.
The diff coverage is 82.22%.

@@            Coverage Diff             @@
##           master     #137      +/-   ##
==========================================
+ Coverage   47.53%   49.31%   +1.78%     
==========================================
  Files          12       12              
  Lines         993     1022      +29     
==========================================
+ Hits          472      504      +32     
+ Misses        462      460       -2     
+ Partials       59       58       -1     

Impacted Files	Coverage Δ
server/server.go	50.31% <60.00%> (-0.63%)	⬇️
server/handlers.go	36.00% <75.00%> (+13.77%)	⬆️
content/content.go	74.69% <100.00%> (+7.00%)	⬆️
server/endpoints.go	100.00% <100.00%> (ø)
server/auth.go	49.29% <0.00%> (+9.85%)	⬆️

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[tisnik]

LGTM in overall, just pls. look at comments

[natiiix]

LGTM; I don't see any obvious issues. 👍