contribute package:jot to dart-lang/labs

[devoncarew]

contribute package:jot to dart-lang/labsL

• contribute an experimental api documentation tool to dart-lang/labs
• update repo infra and meta-data for the new package
• ensure the readme indicates that this is an experimental project

---

• I’ve reviewed the contributor guide and applied the relevant portions to this PR.

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[github-actions]

Package publishing

Package	Version	Status	Publish tag (post-merge)
package:appengine	0.13.11	already published at pub.dev
package:gcloud	0.9.0	already published at pub.dev
package:googleapis_firestore_v1	0.1.0-wip	WIP (no publish necessary)
package:jot	0.1.0-dev	-
package:native_synchronization	0.3.1	already published at pub.dev

Documentation at https://github.com/dart-lang/ecosystem/wiki/Publishing-automation.

[devoncarew]

@szakarias, if this looks good please feel free to land it. I may be able to look at updating to the latest analyzer element model APIs tomorrow; they've changed a bunch in the last year or two.

[szakarias]

Thanks!