asdf info block display

[sydduckworth]

Description

• Added block table output which is optionally printed after the tree
• Added show_blocks parameter to AsdfFile.info method which defaults to False
• Added --show-blocks argument to info CLI command
• Format matches the equivalent libasdf command

Closes #1923

Example Output

❯ asdftool info --show-blocks basic.asdf 
root (AsdfObject)
├─asdf_library (Software)
│ ├─author (str): The ASDF Developers
│ ├─homepage (str): http://github.com/asdf-format/asdf
│ ├─name (str): asdf
│ └─version (str): 4.1.0
├─history (dict)
│ └─extensions (list)
│   └─[0] (ExtensionMetadata)
│     ├─extension_class (str): asdf.extension._manifest.ManifestExtension
│     ├─extension_uri (str): asdf://asdf-format.org/core/extensions/core-1.6.0
│     ├─manifest_software (Software)
│     │ ├─name (str): asdf_standard
│     │ └─version (str): 1.1.1
│     └─software (Software)
│       ├─name (str): asdf
│       └─version (str): 4.1.0
└─data (NDArrayType)
  ├─shape (tuple)
  │ └─[0] (int): 8
  └─dtype (Int64DType): int64
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃                     Block #0                      ┃
┣━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┫
┃ flags          │            0x00000000            ┃
┃ compression    │               None               ┃
┃ allocated_size │                64                ┃
┃ used_size      │                64                ┃
┃ data_size      │                64                ┃
┃ checksum       │ 35594cae5fb11be3ea419c26bc4cfbee ┃
┗━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛

[braingram]

Thanks for working on this. I left a few comments. Overall this is an improvement to the inspectability of files.

As noted I'm not against adding type hints. To check those are correct we'd benefit from first adding a type checker. If you're interested in adding type hints would you make a separate PR that sets up mypy for this project as a pre-commit hook (and addresses any configuration and other issues that might uncover)?

Once the comments are addressed would you update this PR with a comment showing some example block info output?

[braingram]

One minor request to update the test data with padded blocks so that used_size != allocated_size.

[braingram]

Thanks! This looks great and funny enough I was handed an ASDF file today that I already wanted to use this new feature on :)