Add optional untyped/type parameters to getActivities method

[dachia]

Hi, @Pythe1337N

underlying getActivities API can support multiple filters, besides offset or limit. For example, very useful parameters are startDate and endDate, activityType.

I propose that, if possible and make sense, add an optional hashmap parameter to the getActivities call and insert those into request params.

Thank you for all your time and effort!

P.S. If you would prefer it, I can create PR for this

[gregegan]

This makes sense to me, can you put up a PR for this @dachia?

@dachia where are you able to find the docs of all the filters that are supported by each endpoint?

[gregegan]

Mark as resolved @Pythe1337N https://github.com/Pythe1337N/garmin-connect/pull/73/files#diff-b335630551682c19a781afebcf4d07bf978fb1f8ac04c6bf87428ed5106870f5L183