Add tests for `get_bundles_from_transaction_hashes`

[lzpap]

Write test cases for get_bundles_from_transaction_hashes method in iota/commands/extended/utils.py.

Some ideas what to check:

• happy path, everything works as it should.
• empty list provided, empty list returned.
• GetTrytesCommand returns empty response.
• GetTrytesCommand returns only tails.
  GetTrytesCommand returns only non tail txs, tails are correctly determined by fetching additional bundle transactions.
• inclusion state is correctly updated in the response bundle.
• returned bundles are sorted based on tail tx's timestamp
  ...