Add bundled analytics support in Inspector

[zikaari]

[x] I've included a changeset (psst. run yarn changeset. Read about changesets here).

Corresponding Inspector PR - https://github.com/segmentio/segment-inspector/pull/24

[changeset-bot]

🦋 Changeset detected

Latest commit: 58c6081

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@segment/analytics-next	Minor

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[silesky]

I think the build is causing a typescript error because of this line, which is conflicting with ambient declaration merging:

This is the correct declaration:

declare global {
  interface Window {
    analytics: AnalyticsSnippet
  }

All this is complicated by the fact that there's a circular dependency here with analytics-next and '@segment/inspector-webext'. Publishing inspector-webext's types as a separate dependency or just removing that dependency altogether from analytics-next might be a good idea (and doing the typing locally).