[SECENG-601] Added policy logs command to fetch decision audit logs

[sagar-connect]

Checklist

=========

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have checked for similar issues and haven't found anything relevant.
• This is not a security issue (which should be reported here: https://circleci.com/security/)
• I have read Contribution Guidelines.

Changes

=======

• Added policy logs command to fetch policy decision logs
• Added tests to verify the new subcommand

Rationale

=========

Jira: https://circleci.atlassian.net/browse/SECENG-601

[codecov]

Codecov Report

Merging #734 (9baff52) into master (479631b) will increase coverage by 0.69%.
The diff coverage is 73.25%.

@@            Coverage Diff             @@
##           master     #734      +/-   ##
==========================================
+ Coverage   30.59%   31.29%   +0.69%     
==========================================
  Files          44       44              
  Lines        5171     5257      +86     
==========================================
+ Hits         1582     1645      +63     
- Misses       3357     3371      +14     
- Partials      232      241       +9     

Impacted Files	Coverage Δ
api/policy/policy.go	62.58% <71.87%> (+2.58%)	⬆️
cmd/policy/policy.go	80.43% <74.07%> (-2.65%)	⬇️

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[davidmdm]

BIG QUESTION @sagar-connect .

So this is making a single API call to our service to fetch some decision logs, and allowing the user to offset the decisions manually...

Since this is meant to download between a time-range... should we not automatically paginate through the results until there are 0 items left?

My gut feeling is that we should. Although, a valid case could be made otherwise.

Let's discuss this issue before merging!

Otherwise the code looks good!

[am-bui]

LGTM!