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Implement and test support for reading collections in SSTables 3.
Tests: unit {release}
"
* 'haaawk/sstables3/read-collections-v1' of ssh://github.com/scylladb/seastar-dev:
sstables 3: Add tests for reading collections
flat_mutation_reader_assertions: add more flexible asserts
data_consume_rows_context_m: add support for collections
mp_row_consumer_m: Add support for collections
data_consume_rows_context_m: introduce cell_path
Use column_translation::*_is_collection in reading
column_translation: add *_column_is_collection()
column_flags_m: add HAS_COMPLEX_DELETION
Use read_unsigned_vint_length_bytes for COLUMN_VALUE
Use read_unsigned_vint_length_bytes for CK_BLOCKS
Implement read_unsigned_vint_length_bytes