Giza: Refactor common functionality

Storage node and distributor node are currently beeing developed on separate branches and it's clear that there will be a lot of copy-pasted code between them. There is also code duplicated between @joystream/cli and storage/distributor CLIs, query-node and CLIs etc. Some examples include:

• Metadata handling (metadataToBytes / metadataFromBytes) - CLI, storage-node, distributor-node and probably integration tests
• BagId parsing - storage-node, distributor-node, query-node
• CLI base structure - CLI, storage-node, distributor-node
• Logging - storage-node, dsitributor-node
• Query node communication&codegen - CLI, distributor-node, storage-node and probably integration tests
• Storage node communication - CLI, dsitributor-node and probably integration tests

Some of the code may be probably refactored to existing libraries like @joystream/metadata-protobuf or @joystream/types, but it may make sense to introduce another librar/libraries like @joystream/utils or @joystream/js (which was already planned for a long time).

I think the best moment to do this would be once all the parts all already merged, so we can clearly spot and refactor duplicated code hopefully without any major conflicts.