Zapstore uses #m tags in filters for mimetype.
In ndk we have e/p/t/a/d tags hardcoded in Filter.
According to https://github.com/nostr-protocol/nips?tab=readme-ov-file#standardized-tags there can be many more tags, so do Filters need to support any kind of # ?
Purplebase RelayRequest just uses Map<String, dynamic> tags.
What should be our strategy for this?
Need to discuss