Draft: Add paste in the context menu in Web IDE

Blocked

As of 2021-05-07, still blocked by pengx17/monaco-yaml#48

What does this MR do?

Adds paste in the context menu in Web IDE by updating monaco-editor.

Upstream change: https://github.com/microsoft/monaco-editor/compare/v0.20.0...v0.23.0

Screenshots (strongly suggested)

before	after
	TBD

Does this MR meet the acceptance criteria?

Conformity

• 📋 Does this MR need a changelog?
  • I have included a changelog entry.
• Code review guidelines
• Style guides
• Separation of EE specific content

Availability and Testing

• [-] Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Related to #330241 (closed)