Limit length and number of MIME types you can set

Limit character length of MIME types to 255. If this length is exceeded
then a IllegalArugmentException is thrown. The number of MIME types that
can be set is also limited to 500 per MIME group with the number of
total MIME Groups also limited to 500. A IllegalStateException is thrown if this number is exceeded.

Bug: 237291548
Test: Installed and ran POC app from b/237291548
Change-Id: I1d57e674f778cfacdc89225ac3273c432a39af63
Merged-In: I1d57e674f778cfacdc89225ac3273c432a39af63