feat: refactor http/json support into fine-grained modules

[evacchi]

closes #40, supersedes #41

Refactors the Chicory SDK spinning out HTTP and JSON as optional components.

Notes

• HTTP and the implied JSON support must now be explicitly configured
• It will require users to update their dependency management when upgrading. The changes maintain backward compatibility at the API level but the module and some package names have changed

Key Changes

1. Project Structure Reorganization:

   • Converted from a single module to a multi-module Maven project
   • Created a core module for essential functionality
   • Created separate HTTP-related modules for different implementations

2. Module Breakdown:

   • core: Contains the core SDK functionality
   • http/api: Defines HTTP API interfaces
   • http/client-javanet: Implementation using Java's built-in HTTP client
   • http/client-urlconnection: Implementation using HttpURLConnection (for Android)
   • http/json-jackson: JSON implementation using Jackson
   • http/json-jakarta: JSON implementation using Jakarta JSON
   • http/config-generic: Pre-configured setup for standard Java environments
   • http/config-android: Pre-configured setup for Android environments
   • http/integration-tests: Tests for HTTP functionality

3. Package Restructuring:

   • Moved core classes to org.extism.sdk.chicory.core
   • Moved HTTP-related classes to org.extism.sdk.chicory.http.*
   • Created specialized subpackages for different implementations

4. HTTP Configuration Changes:

   • Made HTTP configuration optional rather than defaulting to a specific implementation
   • Improved error handling for missing HTTP configuration
   • Replaced the internal Lazy class with explicit configuration providers

5. Exception Handling:

   • Created more specific exception types
   • Added ExtismConfigurationException for configuration issues
   • Separated HTTP and JSON exceptions from core exceptions

[evacchi]

heads up @ehsavoie, @sap1ens this will be a breaking change

[evacchi]

I wonder if I could just leave the toplevel as chicory-sdk and the package as org.extism.sdk.chicory 🤔 or maybe only rename chicory-sdk -> chicory-sdk-core 🤔