add metric for anchor accepted

[gvelez17]

Add controller metric for Anchor Request Accepted - #WS2-3180

Description

add metric to cas for anchor accepted

How Has This Been Tested?

Describe the tests that you ran to verify your changes. Provide instructions for reproduction.

• [x ] unit tests

metrics generally will not have prod impacting failures

Definition of Done

Before submitting this PR, please make sure:

• The work addresses the description and outcomes in the issue
• I have added relevant tests for new or updated functionality
• My code follows conventions, is well commented, and easy to understand
• My code builds and tests pass without any errors or warnings
• I have tagged the relevant reviewers
• I have updated the READMEs of affected packages
• I have made corresponding changes to the documentation
• The changes have been communicated to interested parties

References:

Please list relevant documentation (e.g. tech specs, articles, related work etc.) relevant to this change, and note if the documentation has been updated.

[gvelez17]

Mohsin wants a few more things so no rush, may add more here

[samika98]

Suggested some changes for renaming based on how the API is being used by js-ceramic :)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.32%. Comparing base (96f079a) to head (f954794).
Report is 1 commits behind head on develop.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1191      +/-   ##
===========================================
+ Coverage    81.29%   81.32%   +0.03%     
===========================================
  Files           46       46              
  Lines         1828     1831       +3     
  Branches       289      289              
===========================================
+ Hits          1486     1489       +3     
  Misses         342      342              

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[samika98]

LGTM