Add language parameter to International Address Autocomplete

[CarterSmarty]

Adds the documented language query parameter to the International Address
Autocomplete API in the Java SDK.

The API documents language for autocomplete, but no Smarty SDK implemented it,
while every SDK already supported it for International Street. This closes that
gap across all nine SDKs.

Companion pull requests

• Go: Add language parameter to International Address Autocomplete smartystreets-go-sdk#67
• Rust: Add language parameter to International Address Autocomplete smarty/smarty-rust-sdk#62
• .NET: Add language parameter to International Address Autocomplete smartystreets-dotnet-sdk#85
• Swift: Add language parameter to International Address Autocomplete smartystreets-ios-sdk#72
• Java: Add language parameter to International Address Autocomplete #95
• JavaScript: Add language parameter to International Address Autocomplete smarty/smartystreets-javascript-sdk#160
• PHP: Add language parameter to International Address Autocomplete smartystreets-php-sdk#95
• Python: Add language parameter to International Address Autocomplete smartystreets-python-sdk#99
• Ruby: Add language parameter to International Address Autocomplete smartystreets-ruby-sdk#91

Tracking task: https://app.clickup.com/t/86bc7x07q

Note

Reuses the existing com.smartystreets.api.international_street.LanguageMode
rather than duplicating or moving it, matching how us_extract imports
us_street.MatchType. Nothing outside international_autocomplete changes, so
this is not a breaking change for International Street consumers.

[mae-smarty]

Maybe add the language parameter to the example for consistency and to demonstrate it.

[andyjohnsonsmarty]

Should have its own language mode from international_street because the could be different