Add support for Dependency Graph Snapshots endpoint

[be0x74a]

Starts Dependency Graph service support by starting with the Create Snapshot endpoint

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.89%. Comparing base (2b8c7fa) to head (fb0a8ef).
Report is 45 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@## master #2856 +/- ##
==========================================
- Coverage 97.72% 92.89% -4.84% 
==========================================
Files 153 171 +18 Lines 13390 11436 -1954 ==========================================
- Hits 13085 10623 -2462 - Misses 215 723 +508 
Partials 90 90 

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[gmlewis]

Thank you, @be0x74a !

[gmlewis]

@be0x74a - we'll leave this PR open for a week or two, but if we haven't heard back from you, we will close this PR as abandoned.

[be0x74a]

@be0x74a - we'll leave this PR open for a week or two, but if we haven't heard back from you, we will close this PR as abandoned.

@gmlewis finally got to it! Sorry for the delay and the force-push, was trying to appease codecov and make it use a recent base but I completely failed...

[gmlewis]

Thank you, @be0x74a !
This looks much better. Just a few minor tweaks, please, then we should be ready for a second LGTM+Approval from any other contributor to this repo before merging.

[be0x74a]

Thanks for the input @gmlewis!

[gmlewis]

Thank you, @be0x74a !
LGTM.

Awaiting second LGTM+Approval from any other contributor to this repo before merging.

[tomfeigin]

LGTM

[gmlewis]

Thank you, @tomfeigin !
Merging.