v0.5.3: Merge pull request #1597 from fetchai/develop

• Adds support for re-starting agent after stopping it
• Adds full test coverage for protocols generator
• Adds support for dynamically adding handlers
• Improves p2p connection startup reliability
• Addresses p2p connection race condition with long running processes
• Adds connection states in connections
• Applies consistent logger usage throughout
• Adds key rotation and randomised locations for integration tests
• Adds request delays in SOEF connection to avoid request limits
• Exposes runtime states on agent and removes agent liveness object
• Adds readme files in protocols and connections
• Improves edge case handling in dialogue models
• Adds support for cosmwasm message signing
• Adds test coverage for test tools
• Adds dialogues models in all connections where required
• Transitions erc1155 skills and simple search to SOEF and p2p
• Adds full test coverage for skills modules
• Multiple docs updates
• Multiple additional tests and test stability fixes