Evaluate as command

[timothypratley]

What has changed?

• Adds a "command" option to custom REPL commands

Fixes #2683

My Calva PR Checklist

I have:

• [x] Read How to Contribute.
• [x] Directed this pull request at the dev branch. (Or have specific reasons to target some other branch.)
• [x] Made sure I have changed the PR base branch, so that it is not published. (Sorry for the nagging.)
• [x] Made sure there is an issue registered with a clear problem statement that this PR addresses, (created the issue if it was not present).
  • [x] Updated the [Unreleased] entry in CHANGELOG.md, linking the issue(s) that the PR is addressing.
• [x] 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.
• [x] Added to or updated docs in this branch, if appropriate
• [x] Tests
  • [x] Tested the particular change
  • [x] Figured if the change might have some side effects and tested those as well.
• [x] Formatted all JavaScript and TypeScript code that was changed. (use the prettier extension or run npm run prettier-format)
• [x] 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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[PEZ]

So sweet! Thanks for working on this! 🙏

[timothypratley]

We are proceeding with #2680 instead. Closing this.