Externalize hard coded strings to properties files

[kathrynkodama]

Set up framework and externalize existing strings

[bensonnw]

Framework for both Jakarta LS and Jakarta JDT LS components:

• Externalize all strings to a separate properties file
• Create a class to define APIs for loading language files, getting actual messages from their keys, formatting the messages with multiple variables etc.

One thing unknown:

We are using JSON file for code completion in Jakarta LS, messages and action details are all defined there, we need a way to handle those messages differently

[bensonnw]

Loading JSON files:

1. JakartaEESnippetRegistryLoader loads each JSON file and adds the contents to SnippetRegistry
2. SnippetRegistry.getCompletionItem(...) to create org.eclipse.lsp4j.CompletionItem object for code completion

[TrevCraw]

New issue open to address creating the Java framework for globalization: https://github.com/eclipse/lsp4jakarta/issues/315

This issue will focus on adding the JSON piece of the framework and externalizing existing strings.

[turkeylurkey]

Modifying the messages and locations requires updates in liberty-tools-intellij https://github.com/OpenLiberty/liberty-tools-intellij/issues/453

[turkeylurkey]

Externalized messages for diagnostics and quick fixes but not snippets.