* Consistent license message for all the go files
* Fixing the last set of unconsistencies with the license headers
* Addressing PR review comments
* Fixing busy.go and busy_test.go license header
* Migrate webhookCache from store/sqlstore/webhook_store.go to the new store/localcachelayer
* Remove duplicated statistics and move several functions to the layer
* Put cache size in format minutes * 60seconds
* Move cache functions to layer functions over the caches
* Directly remove and purge caches in handleClusterInvalidate to avoid loops
* Filtered incoming webhooks for users wihtout PERMISSION_MANAGE_OTHERS_INCOMING_WEBHOOKS
* Filtered outgoing webhooks for users without PERMISSION_MANAGE_OTHERS_OUTGOING_WEBHOOKS
* Refactored GetOutgoingByTeamByUser to its own method in app and store
* Fixed paging condition for outgoing webhooks in store
* Separated test cases into separate t.run in WebhookStore
* Improved unit test. PR Feedback
* Filtered outgoing webhooks by channel for users without PERMISSION_MANAGE_OTHERS
* Filtered getting full list of outgoing webhooks for users without PERMISSION_MANAGE_OTHERS
* Added missing signature for GetOutgoingWebhooksPage in app
* Expanded permissions in test to SYSTEM_USER_ROLE
* Filtered getting full list of incoming webhooks for users without PERMISSION_MANAGE_OTHERS
* Removed unnecessary sq.and operator
* SyncStore: migrate WebHooks.SaveIncoming method to Sync
* MM-15116 Migrates the WebHook.SaveIncoming method to Sync by default
* MM-15116 Migrate Webhook.SaveIncoming to Sync by default - fix minor typo
* MM-15116 Migrate WebHook.SaveIncoming to sync - update test case
* 8272 added the username and icon as part of the model and persisted the same
* 8272 added the custome icon and name when set to the web hook response
* 8272 changed the infinte loop to timeout after 5 seconds
* 8272 fixed review comments
