feat: Add JSON pretty-printing with --indent parameter

[Mr-Punder]

Description

Implements JSON pretty-printing functionality as requested in the issue Indent and format #37. Adds --indent parameter to control output formatting while maintaining rekson's core JSON fixing capabilities.

Changes

• Added --indent parameter with three modes:
  • No --indent: Preserve original spacing (no formatting changes)
  • --indent 0: Compact output (collapse all spaces)
  • --indent N: Pretty-print with N spaces indentation
• New IndentFormatter struct in rekson-lib/src/formatter.rs for handling indentation logic
• Updated CLI in src/cli.rs to parse --indent parameter with proper error handling
• Enhanced library API with process_bytes_with_indent() function
• Updated web interface to support formatting options
• Comprehensive tests covering all indentation scenarios

Implementation Details

• Formatter processes tokens stream and applies indentation rules
• Supports both --indent 4 and --indent=4 syntax
• Zero-space mode produces truly compact JSON output
• Maintains rekson's existing JSON fixing capabilities (comments, quotes, commas, etc.)
• No tabs support as specified in requirements

Testing

# Test basic functionality
echo '{"a":3}' | rekson --indent 2

# Test compact mode  
echo '{"a": 3, "b": [1, 2]}' | rekson --indent 0

# Test without formatting
echo '{"a":3}' | rekson

# Run test suite
cargo test

Examples

# Input: {"name":"test","values":[1,2,3]}
# Output with --indent 2:
{
  "name": "test", 
  "values": [
    1,
    2,
    3
  ]
}

# Output with --indent 0:
{"name":"test","values":[1,2,3]}

Fixes the pretty-printing requirement from the original issue while maintaining backward compatibility.

[pinbraerts]

Надо чуть-чуть полшлифовать пр. По логике не особо смотрел, если работает, то норм.

[pinbraerts]

Удали из пр и добавь .vscode в .gitignore

[pinbraerts]

По идее можно

indent.map(formatter::IndentFormatter::new)

[pinbraerts]

let value = args.get(i + 1).ok_or_else(|| Error("--indent requires a value" ))?;
let indent = value.parse::<usize>()?;
return Ok(Args { indent: Some(indent) });

[pinbraerts]

Зачем этот случай поддерживать, если можно его не поддерживать? Давай забьём на =

[pinbraerts]

Тут явно что-то лишнее