* Update to README.md to include more samples to get started

Storage CloudEvents contain a "bucket" field. The mock data should
return this "bucket" field to accurately reflect live data.

[More info here](https://github.com/firebase/firebase-functions/blob/27a49837ea7b74d9d2926e74c387f45704d57889/src/v2/providers/storage.ts#L185)

* Add CI for firebase-functions-test

This commit adds CI for firebase-functions-test as an additional level
of protection.

This is a duplicate of the {test.yaml from firebase-functions](https://github.com/firebase/firebase-functions/blob/master/.github/workflows/test.yaml)

* Remove `npm run bin:test`; Add `npm run integrationTest`

This commit does the following:

* Remove `npm run bin:test` from ci
* Add `npm run integrationTest` from ci

* ran npm run format:fix

* Refactor MockCloudEvent generation to include user's Partial<CloudEvent>

The goal of this commit is to incorporate the user's partial into the generated CloudEvent.

All the AbstractFactories for Partial Cloud Events now return Cloud Events, and they all
may incorporate the user provided partial when creating the Mock Cloud Event.

Theres a few key benefits to this:

1. Type safety. The Partial Factories were not providing all the necessary fields required (as is the nature of the Partial..)
1. Consistency with other fields. Eg: If a user updates the bucket for storage event, lets attempt to update the other fields too.
1. Opaque fields - If we want the user provided partial to take precedence, we can easily control that. (see PubSub and EventArc factories)
1. Easier to handle one-off behavior. Not all the events behave the same way, particularly with PubSub.

Although this is a "larger" change, the end-user contract remains intact.

This does fix several bugs. Output is different for PubSub, EventArc, and Storage.

Bumps [plist](https://github.com/TooTallNate/node-plist) from 3.0.1 to 3.0.5.
- [Release notes](https://github.com/TooTallNate/node-plist/releases)
- [Changelog](https://github.com/TooTallNate/plist.js/blob/master/History.md)
- [Commits](https://github.com/TooTallNate/node-plist/commits)

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Bumps [minimist](https://github.com/substack/minimist) from 1.2.5 to 1.2.6.
- [Release notes](https://github.com/substack/minimist/releases)
- [Commits](https://github.com/substack/minimist/compare/1.2.5...1.2.6)

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Bumps [path-parse](https://github.com/jbgutierrez/path-parse) from 1.0.6 to 1.0.7.
- [Release notes](https://github.com/jbgutierrez/path-parse/releases)
- [Commits](https://github.com/jbgutierrez/path-parse/commits/v1.0.7)

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Bumps [pathval](https://github.com/chaijs/pathval) from 1.1.0 to 1.1.1.
- [Release notes](https://github.com/chaijs/pathval/releases)
- [Changelog](https://github.com/chaijs/pathval/blob/master/CHANGELOG.md)
- [Commits](chaijs/pathval@v1.1.0...v1.1.1)

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Bumps [glob-parent](https://github.com/gulpjs/glob-parent) from 5.1.1 to 5.1.2.
- [Release notes](https://github.com/gulpjs/glob-parent/releases)
- [Changelog](https://github.com/gulpjs/glob-parent/blob/main/CHANGELOG.md)
- [Commits](gulpjs/glob-parent@v5.1.1...v5.1.2)

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Bumps [ws](https://github.com/websockets/ws) from 7.3.1 to 7.5.7.
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](websockets/ws@7.3.1...7.5.7)

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This commit adds unit test for all the v2 spec items.

As commented, `id`, `time`, and a few others are generated at runtime.
In those instances the assertion does the no-op `thing: thing` check.

With this commit I feel comfortable moving forward with v2.1.0.

Test All The Things!!
*insert all the things meme here*

* Update CHANGELOG for v2.1.0