Add light block to trusted store when missing

[colin-axner]

When a light block is not found, we should pull the header and have the light client verify it and add it to the trusted store. This should fix the majority of the light block not found errors and greatly fix the UX

Specifically here, if the trusted light block is missing, we want to update the light client at that height by getting the header from the connected full node and verifying the header. This will prevent this error from occurring when a client is to be updated