Backend api endpoints

[eguzki]

• Backends

• backend list
• backend create
• backend delete
• backend read
• backend update

• Backend Method

• backend method list
• backend method create
• backend method delete
• backend method read
• backend method update

• Backend Metric

• backend metric list
• backend metric create
• backend metric delete
• backend metric read
• backend metric update

• Backend Mapping Rule

• backend mapping rule list
• backend mapping rule create
• backend mapping rule delete
• backend mapping rule read
• backend mapping rule update

• Backend Usage

• backend usage list
• backend usage create
• backend usage delete
• backend usage read
• backend usage update

[codecov-commenter]

Codecov Report

Merging #24 into master will increase coverage by 13.13%.
The diff coverage is 69.51%.

@@             Coverage Diff             @@
##           master      #24       +/-   ##
===========================================
+ Coverage   25.12%   38.26%   +13.13%     
===========================================
  Files          13       14        +1     
  Lines         780     1108      +328     
===========================================
+ Hits          196      424      +228     
- Misses        553      603       +50     
- Partials       31       81       +50     

Impacted Files	Coverage Δ
client/backend_api.go	69.51% <69.51%> (ø)

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