Hi Perfetto team,

I'd like to suggest a couple of enhancements to the Android log filtering panel to make it more user-friendly and powerful.
Currently, the filtering behavior is as follows:

1. Tag filtering: requires an exact match for the tag.
2. Message filtering: the search is case-sensitive.

I propose the following improvements:

1. Regex support for tag filtering: it would be very helpful to allow filtering tags using regular expressions. For example, a user might want to filter all tags with a certain prefix, like MyApp*. Exact matching is often too restrictive.
2. Case-Insensitive message filtering: making the message search case-insensitive by default would be more practical. It's common to search for log messages without remembering the exact casing, and case-sensitivity can cause users to miss relevant logs.

If you think these suggestions are sensible, I'd be happy to contribute a pull request to implement these features.