Upgrade Bolt 4.0 implementation to Bolt 4.4

[johannessen]

See #22 for the rationale.

I’ve looked through the Bolt Protocol docs and found the following changes or additions might be needed, but I’m not sure if this is a complete list:

• NOOP chunks
• hints in HELLO success
• patch_bolt in HELLO request – feat:patch bolt "utc" support in Bolt 4.4 #23
• routing in HELLO request
• ROUTE request (with extra)
• imp_user in BEGIN and RUN requests

[johannessen]

With the exception of patch_bolt, I think the missing features above all have little relevance to the server’s community version. Therefore, I’d say their implementation should not be prioritised here unless somebody sponsors that work.