fix(docs): fix java sdk documentation (#156)

Key changes include:
- **Remote Content Integration:** The `docusaurus-plugin-remote-content`
is now used to fetch Java SDK examples directly from the
`opentdf/java-sdk` repository. This ensures that the documentation
always reflects the latest version of the SDK.
- **Dynamic Versioning:** The Java SDK version is now managed as a
custom field (`javaSdkVersion`) in `docusaurus.config.ts` and
dynamically inserted into the documentation. This simplifies future
version updates.
- **Code Sample Refactoring:** Existing Java code samples have been
refactored to use the new remote content, improving maintainability and
reducing code duplication.

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Signed-off-by: Scott Hamrick <2623452+cshamrick@users.noreply.github.com>

Author: cshamrick

.gitattributes

@@ -0,0 +1 @@
+code_samples/java/** linguist-generated=true