Support multiple `SemanticTokensProvider`s from LSP standpoint

[BoykoAlex]

Java language may have multiple semantic tokens providers simultaneously to provide syntax highlighting for languages embedded inside Java annotations. For example, HQL/JPQL/SQL queries, SPEL expressions etc.

Currently VSCode only effectively supports one semantic tokens providers. The request to support many is: https://github.com/microsoft/vscode/issues/212650

Eclipse seems to be way behind for Java: #1235 covers Eclipse side