Add context parameters to SemanticDB synthetics

[natsukagami]

Fix #22936

Depends on scalameta/scalameta#4272 (for the generated SemanticsDB to be consumable).

• Add ApplyContextTree from generated code, generated at https://github.com/natsukagami/semanticdb-for-scala3/tree/apply-context-tree
• Use ApplyContextTree instead of ApplyTree for context parameter applications