Add docs around UTXO dismantling/consolidation

[Torres-ssf]

Typical use cases are:

1. Split one UTXO into several
2. Consolidating several UTXOs into one

Examples:

• 1x UTXO with a value of 1000 could be split into 10x UTXOs, each valued at 100
• 100x UTXOs with a value of 10 could be consolidated into 1x UTXO valued at 1000

Notes:

• Fee must be subtracted before the split/consolidation
• Chain constraints limit the maximum number of outputs allowed per transaction

[maschad]

@Torres-ssf @arboleya perhaps I may be misinterpreting but after reading through the combining UTXO docs I think the only documentation that is missing is regarding the maxOutputs which are determined by the chain config. I've added that to the docs in this PR