feat(entities): Support custom attributes JSON (2)

[amolero-nr]

Supports JSON strings for --customAttributes in the newrelic entity deployment create command for deployment markers. Ref: NR-165686.

*** Requires *** newrelic/newrelic-client-go#1063 in a newrelic-client-go release > 2.22.0

[codecov]

Codecov Report

Merging #1531 (5c9764c) into main (e1bf884) will increase coverage by 0.14%.
The diff coverage is 59.45%.

@@            Coverage Diff             @@
##             main    #1531      +/-   ##
==========================================
+ Coverage   47.34%   47.49%   +0.14%     
==========================================
  Files         125      125              
  Lines        7724     7751      +27     
==========================================
+ Hits         3657     3681      +24     
- Misses       3926     3930       +4     
+ Partials      141      140       -1     

Files	Coverage Δ
internal/entities/command_deployment.go	57.14% <59.45%> (+5.58%)	⬆️

... and 1 file with indirect coverage changes

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