Changes language id for java to match the allowlist in the lsp server

[dingfeli]

Issue #, if available:
https://issues.amazon.com/issues/ECLIPSE-220

Description of changes:
This PR is to enable cross file context. And it looks like for the most part cross file context is already working.
The commit for the LSP side to support this was just recently shipped: aws/language-servers@813978f

The only thing we needed to change on the toolkit's side is to change the languageid to match the list of supported language: https://github.com/aws/language-servers/blob/a419c76ad82d5568b44d793bac6e5dc8c9b00dfc/server/aws-lsp-codewhisperer/src/language-server/utilities/supplementalContextUtil/crossFileContextUtil.ts#L20-L38

Test

After having made this change, I was able to see all the files from the workspace via printing it here:

+++ b/server/aws-lsp-codewhisperer/src/language-server/utilities/supplementalContextUtil/crossFileContextUtil.ts
@@ -16,6 +16,7 @@ import {
     Range,
 } from '@aws/language-server-runtimes/server-interface'
 import { CancellationError } from './supplementalContextUtil'
+import * as fs from "fs"

 type CrossFileSupportedLanguage =
     | 'java'
@@ -55,6 +56,19 @@ export async function fetchSupplementalContextForSrc(
     cancellationToken: CancellationToken
 ): Promise<Pick<CodeWhispererSupplementalContext, 'supplementalContextItems' | 'strategy'> | undefined> {
     const shouldProceed = shouldFetchCrossFileContext(document.languageId)
+    const documents = await workspace.getAllTextDocuments();
+    fs.appendFile("/Users/dingfeli/output.txt", `should proceed: ${shouldProceed}\ndocument length: ${documents.length}\nlanguageid: ${document.languageId}\n`, (err) => {
+        if (err) {
+            console.log("Error writing to file");
+        }
+    });
+    for (let doc of documents) {
+        fs.appendFile("/Users/dingfeli/output.txt", `document name: ${doc.uri}\n`, (err) => {
+            if (err) {
+                console.log("Error writing to file");
+            }
+        });
+    }

Output.txt:

should proceed: true
document length: 2
languageid: java
document name: file:///Users/dingfeli/eclipse-workspace/toy/src/toy/Helper.java
document name: file:///Users/dingfeli/eclipse-workspace/toy/src/toy/Main.java

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