Add npm as a dependency for macOS

[a1291762]

npm is a dependency, and it is listed as such for Ubuntu, but not for macOS.

I could not get the pebble SDK installed until I had npm. Since we are being directed to use homebrew, and it can install npm, do that.

[a1291762]

[Thirteen:~/src/developer.rebble.io] [fix_sdk_setup_macos] link$ pebble sdk install latest
Installing SDK...

By using the Pebble SDK, you agree to the following:

PEBBLE TERMS OF USE
https://developer.rebble.io/developer.getpebble.com/legal/terms-of-use/index.html

PEBBLE DEVELOPER LICENSE
https://developer.rebble.io/developer.getpebble.com/legal/sdk-license/index.html

Downloading...
100%[=====================================================]   5.0 MiB/s 0:00:07
Extracting...
Preparing venv... (this may take a while)
Installing dependencies...
Collecting freetype-py>=2.5.1
  Using cached freetype_py-2.5.1-py3-none-macosx_10_9_universal2.whl (1.7 MB)
Collecting sh>=2.2.1
  Using cached sh-2.2.2-py3-none-any.whl (38 kB)
Collecting pypng>=0.20220715.0
  Using cached pypng-0.20220715.0-py3-none-any.whl (58 kB)
Installing collected packages: sh, pypng, freetype-py
Successfully installed freetype-py-2.5.1 pypng-0.20220715.0 sh-2.2.2
WARNING: You are using pip version 21.2.4; however, version 25.3 is available.
You should consider upgrading via the '/Users/link/Library/Application Support/Pebble SDK/SDKs/4.9.77/.venv/bin/python -m pip install --upgrade pip' command.
Installing JS dependencies... (this may take a while)
Failed.
Cleaning up failed install...
Done.
You must have npm ≥ 3.0.0 available on your path.

A new SDK, version 4.9.77, is available! Run `pebble sdk install 4.9.77` to get it.
Check out the release notes at https://developer.rebble.io/developer.pebble.com/sdk/changelogs/4.3/index.html

After brew install node

Installing JS dependencies... (this may take a while)
Downloading toolchain...
100%[=====================================================]   5.0 MiB/s 0:00:12
Extracting toolchain...
Done.
Installed.

I don't think homebrew separates node from npm though, as after installing one, the other is already installed?

[Sorixelle]

Awesome, thanks for the PR!