Implementation of Byte Size and Time Duration Parsing with AggregateStats Directive

[Adnanmuhamed]

This implementation adds support for parsing and handling byte sizes and time durations in the Wrangler library. The changes include:

1. New Classes:

   • ByteSize.java: Implements parsing and conversion of byte sizes (KB, MB, GB, TB, PB)
   • TimeDuration.java: Implements parsing and conversion of time durations (ns, ms, s)
   • AggregateStats.java: New directive for aggregating statistics based on size and time columns
   • AggregateStatsTest.java: Comprehensive test coverage for all new functionality

2. Modified Files:

   • TokenType.java: Added BYTE_SIZE and TIME_DURATION types
   • Directives.g4: Added grammar rules for byte size and time duration parsing

Key Features:

• Robust parsing of byte sizes and time durations with proper error handling
• Support for unit conversion between different formats
• Comprehensive test coverage including edge cases
• Follows Java 8 standards and project conventions
• Proper error handling for invalid formats

The implementation allows users to:

• Parse and convert between different byte size units (KB, MB, GB, TB, PB)
• Parse and convert between different time duration units (ns, ms, s)
• Aggregate statistics based on size and time columns using the new AggregateStats directive

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.