* renames to offline_log_viewer since it is not limited to metadata
anymore and we can parse actual record data.
* tools/storage.py is obselete.

Includes compression type and whether the batch is
transactional/control type.

Some topics are in kafka_internal ns like
tx (transaction coordinator) and id_allocator.

Example:

INFO:viewer:{
  "header_crc": 1126531443,
  "batch_size": 90,
  "base_offset": 3,
  "type": 9,
  "crc": 1766141844,
  "attrs": 32,
  "delta": 0,
  "first_ts": 1656554802864,
  "max_ts": 1656554802864,
  "producer_id": 1002,
  "producer_epoch": 1,
  "base_seq": -1,
  "record_count": 1,
  "type_name": "tx_prepare", <====
  "expanded_attrs": {
    "compression": "none",
    "transactional": false,
    "control_batch": true,
    "timestamp_type": false
  }
}

Moves the logic in KafkaLog like other methods,
cleans up duplicate code.

Introduces KafkaControlRecordType

For transactional && control records we extract
the exact control record type(commit/abort).

Switch to the enum in various other places for
readability.