authorize: add databroker server and record version to result, force sync via polling

[calebdoxsey]

Summary

Add databroker_server_version and databroker_record_version to the rego policy and evaluator result. This is useful for auditing.

• Change UpdateRecord so that it takes in the server version as well, and updates all 3 values within a transaction so that the version is consistent
• Change how forceSync works so that it polls for the record to appear instead of overwriting it. This is necessary so that we don't apply changes out of order

Checklist

• reference any related issues
• updated docs
• updated unit tests
• updated UPGRADING.md
• add appropriate tag (improvement / bug / etc)
• ready for review

[codeclimate]

Code Climate has analyzed commit c918f14 and detected 0 issues on this pull request.

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[codecov]

Codecov Report

Merging #2024 (c918f14) into master (4218f49) will decrease coverage by 0.0%.
The diff coverage is 45.3%.

@@           Coverage Diff            @@
##           master   #2024     +/-   ##
========================================
- Coverage    59.6%   59.6%   -0.1%     
========================================
  Files         158     159      +1     
  Lines       10847   10908     +61     
========================================
+ Hits         6469    6504     +35     
- Misses       3640    3663     +23     
- Partials      738     741      +3     

Impacted Files	Coverage Δ
internal/databroker/config_source.go	56.0% <ø> (+1.7%)	⬆️
internal/identity/manager/sync.go	0.0% <ø> (ø)
authorize/sync.go	32.0% <36.2%> (+32.0%)	⬆️
authorize/evaluator/result.go	41.1% <41.1%> (ø)
authorize/evaluator/store.go	75.5% <56.2%> (+0.7%)	⬆️
authorize/evaluator/evaluator.go	69.0% <100.0%> (+10.7%)	⬆️
authorize/grpc.go	78.9% <100.0%> (-0.2%)	⬇️
pkg/grpc/databroker/syncer.go	95.8% <100.0%> (ø)
config/validate.go	15.7% <0.0%> (-3.0%)	⬇️
internal/databroker/server.go	50.0% <0.0%> (-1.0%)	⬇️
... and 5 more

[wasaga]

I'm unsure about waitForRecord

[calebdoxsey]

This conflicts with #2041. Will wait on that review before making changes.