Add pause and resume recoding APIs

When a program is inserted during recoding(ex. Flash News), some
applications want to pause that temporary.
Add pause and resume recording feature so that it permits to tune on
pause status while recoding.

Bug: 172029807
Test: run cts -m CtsTvTestCases -t
android.media.tv.cts.TvInputServiceTest

Change-Id: Ib11ae5d3eddcd01dbd48efa58fb2d4011040b210