Pre-release 0.9: header packet filtering support.

- support for generic container filters
- simple base class for header-only filters
- filter for removing unreadable packets
- filter for duplicating readable packets for new recipient(s)
- major refactoring of internal container implementation modules structure
- move from ABC to Protocol
- documentation for the new interfaces

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "oarepo_c4gh"
-version = "0.8"
+version = "0.9"
 authors = [
   { name = "Dominik Pantůček", email = "[email protected]" }
 ]