Replace eslint-plugin-jsdoc by extending local jsdoc-format rule, saving ~20% of our linting time

[jakebailey]

I had to write an ESLint rule for our JSDoc comments in the module conversion anyway. Extend it to do some basic checking of the alignment of the comments, which is all we use the jsdoc plugin for. (To be clear, I wrote this logic from scratch; the jsdoc plugin probably does a lot more.)

Before:

npx eslint .  54.13s user 2.26s system 148% cpu 37.867 total

After:

npx eslint .  47.32s user 2.15s system 155% cpu 31.846 total

Probably deserves a test or two; I neglected writing any for my original rule.

[sheetalkamat]

Perf is always great