Feat: Handling messages limit based on messages size

[gabrielmatau79]

The addMessage method implements the calculation of message size only (payload) in bytes for storage. Additionally, a constraint is implemented in the takeFromQueue function to return the number of messages that occupy up to 1 MB by default, which can also be configurable.

[genaris]

Some minor suggestions about naming to make it more aligned with specs in the DIDComm world.

Also we would need to update the client to allow sending this new limitBytes parameter in takeFromQueue. A simple way I'm thinking of is about adding a maxReceiveBytes?: number in MessagePickupRepositoryClient constructor:

constructor(options: { private readonly url: string, private readonly maxReceiveBytes?: number}) {}

And pass this.maxReceiveBytes when calling the RPC method. Of course, this is not ideal but it is a solution to support it without requiring any modification into credo-ts and its MessagePickupRepository interface.