RPC method to publish bamboo entry

[adzialocha]

Implement panda_publishEntry RPC method.

Steps:

• Decode encodedEntry and encodedMessage hex strings to bytes
• Verify schema of CBOR payload via CDDL
• Check if schema hash and log id are correct
• Decode Bamboo entry
• Get backlink and skiplink from database
• Verify bamboo entry integrity with backlink and skiplinks
• Insert entry in entries table
• Upsert used log id in logs table

Related:

• Add basic data types p2panda#23