feat: Add support for BSON file format

[Else00]

Hi, this PR adds support for viewing BSON files in jless.

Changes:

• Adds the --bson flag to explicitly parse BSON.
• Automatically detects the .bson file extension.
• Internally, the BSON data is decoded into a JSON string and then processed by the existing rendering engine. This reuses the current UI and logic.
• Includes a unit test for the BSON parsing logic.

Let me know if any changes are needed!

[Else00]

@PaulJuliusMartinez