Most common filesystems limit paths to 255 bytes.
This change brings down the media ID length to be similar to
Synapse servers (25), and makes it possible for clients to
download media with the ID included in the filename.
feat: first steps towards joining rooms over federation
Add state-res as a dependency of conduit
Add reverse_topological_power_sort before append_pdu
Implement statehashstatid_pduid tree for keeping track of state
Clean up implementation of state_hash as key for tracking state
