[GH-207] Added CRUD operations in autolink plugin

[Kshitij-Katiyar]

Summary

• The Autolink Client API currently only supports Add operation only. So added CRUD operations in the Autolink plugin.

Issue

• Issue #207

[mattermost-build]

Hello @Kshitij-Katiyar,

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[Kshitij-Katiyar]

@m1lt0n Not able to add you as a reviewer here.

[mattermost-build]

This PR has been automatically labelled "stale" because it hasn't had recent activity. A core team member will check in on the status of the PR to help with questions. Thank you for your contribution!

[mattermost-build]

This PR has been automatically labelled "stale" because it hasn't had recent activity. A core team member will check in on the status of the PR to help with questions. Thank you for your contribution!

[Kshitij-Katiyar]

@mgdelacroix Please re-review

[mgdelacroix]

@Kshitij-Katiyar could you please add some tests on the endpoints?

[Kshitij-Katiyar]

@Kshitij-Katiyar could you please add some tests on the endpoints?

@mgdelacroix Added unit test cases.

[hanzei]

@mgdelacroix @calebroseland Gentle reminder to review this PR. It's needed for the JIRA plugin.

[raghavaggarwal2308]

@mgdelacroix Gentle reminder for review

[raghavaggarwal2308]

@mgdelacroix Gentke reminder for review