QoL: Turn on automatic commit of changesets (#1097)

## Summary:

The `changesets` tooling supports a configuration option that causes `yarn changeset` to automatically add and commit the created file ([docs](https://github.com/changesets/changesets/blob/main/docs/config-file-options.md#commit-boolean-or-module-path-as-a-string-or-a-tuple-like-modulepath-string-options-any)).  

NOTE: If there are existing changes in your local repo, these changes _will not_ be included in the commit (so it's safe to run `yarn changeset` no matter the state of your repo).

There are PRs in other Khan Academy repos that use the Changesets tooling. We'll only land this if there's consensus across these other repos too:

  * #1097 (this PR)
  * Khan/wonder-blocks#2394
  * Khan/perseus#2008

Issue: "none"

## Test plan:

`yarn changeset` 
Fill in the details 
Once complete, run `git log` and you will see that the changeset entry you created has been added and committed to git - all that's left is to create the PR!

Author: jeremywiebe

Reviewers: jeresig, somewhatabstract

Required Reviewers:

Approved By: jeresig

Checks: ✅ codecov/project, ✅ Test (macos-latest, 20.x), ✅ Test (macos-latest, 20.x), ✅ Lint, typecheck, and coverage check (ubuntu-latest, 20.x), ✅ Lint, typecheck, and coverage check (ubuntu-latest, 20.x), ✅ Prime node_modules cache for primary configuration (ubuntu-latest, 20.x), ⏭️  gerald, ⏭️  gerald, ✅ Prime node_modules cache for primary configuration (ubuntu-latest, 20.x), ✅ Test (macos-latest, 20.x), ✅ CodeQL, ✅ Lint, typecheck, and coverage check (ubuntu-latest, 20.x), ✅ gerald, ✅ Prime node_modules cache for primary configuration (ubuntu-latest, 20.x), ✅ Analyze (javascript), ⏭️  dependabot

Pull Request URL: #1097

.changeset/config.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://unpkg.com/@changesets/[email protected]/schema.json",
   "changelog": "@changesets/cli/changelog",
-  "commit": false,
+  "commit": true,
   "linked": [],
   "access": "public",
   "baseBranch": "main",
@@ -10,4 +10,4 @@
   "___experimentalUnsafeOptions_WILL_CHANGE_IN_PATCH": {
     "updateInternalDependents": "always"
   }
-}
+}

.changeset/odd-mirrors-dance.md

@@ -0,0 +1,2 @@
+---
+---