DOC-2346: Updated Angular technical reference page to support tinymce-angular v8 changes

[danoaky-tiny]

Ticket: DOC-2346

Site: Staging branch

Changes:

• Added licenseKey info
• Updated Angular version table to match what is in tinymce-angular's README.md
• Updated event list to include the new events in v8

Pre-checks:

• [x] Branch prefixed with feature/<version>/, hotfix/<version>/, staging/<version>/, or release/<version>/
• [x] ~modules/ROOT/nav.adoc has been updated (if applicable)~
• [x] Files has been included where required (if applicable)
• [x] Files removed have been deleted, not just excluded from the build (if applicable)
• [x] ~Files added for New product features, and included a release note entry.~

Review:

• [x] Documentation Team Lead has reviewed