Record types

[bentsherman]

This PR implements the first preview of record types:

• Add Record type to standard types
• Add record() function to create a record from named arguments
• Add record types via record keyword for validating records
• Add ability to destructure a record in a process input
• Fix hashing of records

TODO:

• Add ability to include records across modules
• Add ability to stage record type ?
• Add unit tests
• Add e2e tests

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[bentsherman]

This PR does not make any changes to operators, so you need some extra logic in some cases to pass records through an operator.

For example, given two record channels that you want to join:

samples_ch = fastqc_ch.join(quant_ch, by: 'id')

The above syntax is what we'd like to do, but join doesn't work with records yet, so you have to wrap the records as tuples before the join and unwrap after the join:

samples_ch = fastqc_ch.map { r -> tuple(r.id, r) }
    .join( quant_ch.map { r -> tuple(r.id, r) } )
    .map { id, r1, r2 -> r1 + r2 }