fix: replace IMarkdownSourceCode with MarkdownSourceCode

[lumirlumir]

Hello,

This PR addresses issue eslint/rewrite#175.

I also added rollup-plugin-delete to fix the build issues in CI. It's the same plugin used in JSON's rollup.config.js.

Summary

When using IMarkdownSourceCode, we don't have access to methods like getParent, getAncestors, getText, and lines. To fix this, I replaced it with MarkdownSourceCode, which does provide those methods. This approach is already being used in the JSON plugin.

Fixes

Fixes: eslint/rewrite#175.

[eslint-github-bot]

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[nzakas]

LGTM. Thanks!

Would like @fasttime to review before merging.

[fasttime]

There's a merge conflict now.

[lumirlumir]

@fasttime

I've removed the IMarkdownSourceCode interface and replaced it with MarkdownSourceCode in 6330ad4.

Let me know if you need anything else!

[fasttime]

Note that there is a new merge conflict now in src/language/markdown-source-code.js.

[lumirlumir]

@fasttime

I've exported the TextSourceCode type in 6a90d10.

It's now generic, with default options included!

[nzakas]

LGTM pending @fasttime's approval.

[fasttime]

LGTM, thanks!