Feature: Rest log streaming

[sayan-biswas]

Closes #601

Changes

• Response message in proto definition changed for GetLog, to return raw bytes with content type "text/plain"
• Buffered writer implementation updated to work with different interface for updating and accessing logs.

Submitter Checklist

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• [ ] Has Docs included if any changes are user facing
• [ ] Has Tests included if any functionality added or changed
• [x] Tested your changes locally (if this is a code change)
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Release Notes

action required: The gRPC and REST response for GetLog API changed. Refer to the REST API Specs doc.

[tekton-robot]

Skipping CI for Draft Pull Request. If you want CI signal for your change, please convert it to an actual PR. You can still manually trigger a test run with /test all

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-results-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/logs/writer.go	85.7%	80.0%	-5.7

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-results-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/logs/writer.go	85.7%	84.8%	-0.9

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-results-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/logs/writer.go	85.7%	84.8%	-0.9

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-results-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/logs/writer.go	85.7%	84.8%	-0.9

[sayan-biswas]

/test pull-tekton-results-integration-tests

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: avinal, khrm

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/tektoncd/results/blob/main/OWNERS)~~ [avinal,khrm] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[sayan-biswas]

/approve Tested, it works as expected. Tested on very large log files too (~100k lines)

Click here to see tests Few questions:

• should the tkn-results update be included in this PR?
• Docs for handling large logs be updated/deleted?

I don't think tkn-results will need any change. I'll check and update in this PR if required. The document for handling large logs will not be relevant anymore, I can delete it as a part of this PR.

[tekton-robot]

The following is the coverage report on the affected files. Say /test pull-tekton-results-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/logs/writer.go	85.7%	84.8%	-0.9

[sayan-biswas]

/approve Tested, it works as expected. Tested on very large log files too (~100k lines)

Click here to see tests Few questions:

• should the tkn-results update be included in this PR?
• Docs for handling large logs be updated/deleted?

Removed doc "handling large logs"