redo a lot of the structure of core

[williamhorning]

this pr will solve #57 and help #38

• [x] make deno publish --dry-run work in core (this PR)
  • [x] move r2d2 dependency to JSR (blocked on iuioiua/r2d2#166)
  • [x] move mongo dependency to JSR (blocked on denodrivers/mongo#408)
  • [X] get rid of all function overloading (workaround for denoland/deno#22910)
  • [x] figure out why editing doesn't work anymore
  • [x] fix editing again
  • [x] clean up public api
• [x] actually publish (this PR)
  • [x] make workflow to publish (see jsr docs > guide > publishing)
  • [x] find way to distinguish between hosted and core
  • [x] update docs
  • [X] actually publish core 0.6.0 to JSR (not breaking)
• [ ] deal with existing issues next that pertain to code
  • [ ] #19
  • [x] #39
  • [ ] #46
  • [ ] #49
  • [ ] #54
• [ ] move plugins outside of repo
  • [ ] make them depend on the JSR version of bolt 0.6 (still in this repo)
  • [ ] make them work as JSR packages (pass --dry-run)
  • [ ] publish to JSR
  • [ ] move to different repo
• [ ] move all repos to one org
• [ ] make plugins more independent of core since they could be really useful for others