add initial idea for flares

[timothypratley]

DRAFT

What has changed?

• Evaluate now calls flareHandler.inspect on all values it receives from the REPL server
• Added flareHandler that identifies flares (requests for IDE behavior) and dispatches them by type
• Added a webview constructor to handle flares requesting to display html

Fixes #2679

My Calva PR Checklist

I have:

• [*] Read How to Contribute.
• [*] Directed this pull request at the dev branch. (Or have specific reasons to target some other branch.)
• [*] Made sure I have changed the PR base branch, so that it is not published. (Sorry for the nagging.)
• [*] Made sure there is an issue registered with a clear problem statement that this PR addresses, (created the issue if it was not present).
  • [*] Updated the [Unreleased] entry in CHANGELOG.md, linking the issue(s) that the PR is addressing.
• Figured if anything about the fix warrants tests on Mac/Linux/Windows/Remote/Whatever, and either tested it there if so, or mentioned it in the PR.
• Added to or updated docs in this branch, if appropriate
• Tests
  • Tested the particular change
  • Figured if the change might have some side effects and tested those as well.
• Formatted all JavaScript and TypeScript code that was changed. (use the prettier extension or run npm run prettier-format)
• Confirmed that there are no linter warnings or errors (use the eslint extension, run npm run eslint before creating your PR, or run npm run eslint-watch to eslint as you go).

Ping @PEZ, @bpringe, @corasaurus-hex, @Cyrik

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