Inline palm_civet dependency

[rubionic]

Summary

This PR inlines the palm_civet gem into the cloud_controller codebase to eliminate an external dependency that hasn't been updated in several years.

Changes

• Added lib/cloud_controller/palm_civet.rb - Inlined implementation of the palm_civet byte conversion utilities
• Added spec/unit/lib/cloud_controller/palm_civet_spec.rb - Complete test suite from the original gem
• Updated lib/cloud_controller/app_manifest/byte_converter.rb - Changed require from 'palm_civet' to 'cloud_controller/palm_civet'
• Removed palm_civet gem from Gemfile

Implementation Details

The inlined code is wrapped in the VCAP::CloudController::PalmCivet module to maintain proper namespacing and avoid conflicts. The implementation includes:

• Byte size constants (BYTE, KILOBYTE, MEGABYTE, GIGABYTE, TERABYTE)
• byte_size - Converts bytes to human-readable format
• to_bytes - Parses human-readable byte strings to integer bytes
• to_megabytes - Parses human-readable byte strings to megabytes
• InvalidByteQuantityError exception class

All original functionality and tests have been preserved.

Testing

The complete test suite from the palm_civet gem has been integrated and should pass in CI. The tests cover:

• Byte size formatting with various units
• Parsing of different byte unit formats (B, K/KB/KiB, M/MB/MiB, G/GB/GiB, T/TB/TiB)
• Float and integer handling
• Negative values
• Error cases for invalid inputs

Fixes rubionic#1

[sethboyles]

I think if we inline this gem, we should rename the module to something more descriptive as to its purpose.

(ByteConverter might have been a good choice :))

[tcdowney]

@XenoPhex do you want to save Palm Civet from Rubin Bot?

🐒 vs 🤖

[Gerg]

Here is a technical diagram to assist with understanding.

Please confirm the implementation conforms to this architecture @rubionic.

[XenoPhex]

Y’all just want to take it over? I could transfer it to y’all. I’ll just need to figure out the best way to do that in both GH and RubyGems.

Also, hi everyone!! Hope y’all are doing well!!

[philippthun]

I'm also in favor of renaming it.

And we should add a header to the two files added to the cloud controller repo. Something like:

# Derived from the palm_civet library
# Copyright (c) 2013 Anand Gaitonde
# Licensed under the MIT License
# https://github.com/goodmustache/palm_civet

MIT License ... requiring preservation of copyright and license notices.