Add redis opencensus metrics to the server

[taddari]

Fixes #266

Proposed Changes

• Change redigo to opencensus/redigo
• Change redisstore to instrumented redisstore

Release Note

Add redis opencensus metrics to the verification server, this will enable to monitor problems with redis connections itself.

[google-oss-robot]

Hi @taddari. Thanks for your PR.

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[sethvargo]

Redis bits look good. Gonna defer to @icco on the metrics.

[mikehelmick]

this LGTM, but will wait until not draft

[mikehelmick]

/ok-to-test

[icco]

@taddari: The following test failed, say /retest to rerun all failed tests:

Test name Commit Details Rerun command
pull-en-server-release-unit 1d545e6 link /test pull-en-server-release-unit

This is just saying you need to run go mod tidy

[icco]

/assign

[taddari]

/retest

[icco]

/lgtm
/approve

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: icco, taddari

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