Expand The API Endpoints to Allow for More Filtering #189

Some pages, for example the eventual player page, would benefit from being able to filter more on the players api endpoint. For example, searching for stats for one player, across all seasons that player is present.

I am proposing updating the api to allow for filtering the return array based on any field that makes sense. We probably do not need to support filtering on all fields (example: all players with 4 goals) but searching across seasons and leagues would be helpful for our pages and end users of the API.