Move LL filter creation inside MatrixClient
Move LL filter creation inside MatrixClient

As we need an option to turn lazy loading on (we can't just accept a filter,
as /messages has an incompatible filter), better only pass the option
and create the filter inside startClient

matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk