feat: configio

[GregoryAlbouy]

⚠️ DO NOT MERGE until it targets master

Description

Changes

• [x] Relocate configfile from benchttp/cli into this repo
• [x] Normalize API around Unmarshal and NewDecoder(in).Decode(&dst)
• [x] Refactor implementation and tests for file unmarshaling (configio.file)
• [x] ~Dedicated package documentation (go doc + readme)~ ➡️ #65
• [x] ~Expose configio.file?~ ➡️ No use case for now
• [x] ~Static errors for decoders (same as file errors)~ ➡️ TODO: create issue for error handling
• [x] ~Rethink configio.Representation? (hardly usable besides direct unmarshaling)~ ➡️ #61
• [x] ~Implement encoding functions: benchttp.Runner -> configio.Representation -> []byte (json/yaml)~ ➡️ #63

Notes

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (feat/major-api-improvements@a3b1225). Click here to learn what that means. The diff coverage is n/a.

@@                      Coverage Diff                       @@
##             feat/major-api-improvements      #59   +/-   ##
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  Coverage                               ?   81.64%           
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  Files                                  ?       27           
  Lines                                  ?      899           
  Branches                               ?        0           
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  Hits                                   ?      734           
  Misses                                 ?      137           
  Partials                               ?       28           

Flag	Coverage Δ
unittests	81.64% <0.00%> (?)

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