Add Garmin connector

[AndyReifman]

Adding the ability to sync activities from Garmin. Garmin doesn't expose a public API, but there is a python package called garminconnect, so I wrote a small python script that allows for authentication and syncing of activities.

I'm not super familiar with Typescript so I mostly duplicated what the Strava connector is doing with a few hacky bits here and there to make the Python code fit. I'm sure there are cleaner ways to accomplish what I've done.

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A few caveats/notes

• This has not been overly extensively tested. It has been working for me to sync new activities, but I haven't really tried any weird edge or corner cases. Additionally I've only tested syncing a small number of types of activities
• This has all been done on a Linux machine. I do not have a Windows or Mac to test on. Theoretically it should work, especially on a Mac, but I'm not positive.
• It uses the same duplicate activity logic as the other connectors so it should not overwrite/duplicate any activities you synced via Strava or file connectors
• I added an option to use Garmin activity titles if you want (similar to how the Strava connector works), however, for now at least I am only replacing activities with the default activity name. i.e. Morning/Afternoon <activity type>

[codacy-production]

Not up to standards ⛔

🔴 Issues 4 medium

Alerts:
⚠ 4 issues (≤ 0 issues of at least minor severity)

Results:
4 new issues

Category	Results
Complexity	4 medium

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🟢 Metrics 116 complexity · 4 duplication

Metric	Results
Complexity	116
Duplication	4

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[thomaschampagne]

Hi @AndyReifman . Thanks a lot for this ! Wanted to do it for years.

I will take a look at it under the 2 next weeks !

Thanks ! I know it's huge !

[steffenr]

I was in search for exactly this feature, since i had been experimenting with the garminconnect library within another side playground "project".
Great to see, that you got it working @AndyReifman.

I just run a test build/ package with your branch the sync is working really fine for me.

Environment: MacOS 27.0 Beta (26A5388g)

• Garmin Account with more than 2500 activities (mostly bike rides with lots of data to process)
• Existing activities are being skipped correctly (those were previously imported from strava)