Add support for Apple M1 Silicon

[a-maurice]

Description

Provide details of the change, and generalize the change in the PR title above.

Now that we are building on GHA, we can add support for Apple Silicon chips. This adds logic to the python script to build both x86_64 and arm64, and then merge them together with lipo.

---

Testing

Describe how you've tested these changes.

Validating that the bundle files have both symbols, and running it locally on an M1 Mac.

---

Type of Change

Place an x the applicable box:

• Bug fix. Add the issue # below if applicable.
• New feature. A non-breaking change which adds functionality.
• Other, such as a build process or documentation change.

---

#278

[github-actions]

❌  Integration test FAILED

Requested by @a-maurice on commit fc9b605
Last updated: Tue May 10 17:24 PDT 2022
View integration test log & download artifacts

Failures	Configs
firestore	[TEST] [FAILURE] [2019] [macos] [1/5 Platform(s): Android] [1/2 Test Device(s): android_target]
messaging	[TEST] [ERROR] [2019] [macos] [2/5 Platform(s): iOS Android] [All 2 Test Device(s)]
storage	[BUILD] [ERROR] [2019] [macos] [All 3 Platform(s)]