Prefix Neo4j schema labels and relationship types with TS

[rahlk]

The target Neo4j holds Applications projected from multiple source languages. Node labels (Application, Class, Callable, ...) and relationship types (HAS_MODULE, CALLS, ...) are shared across languages, so downstream analytics cannot attribute a node to a language by label alone.

Prefix every node label with TS (Application -> TSApplication) and every relationship type with TS_ (HAS_MODULE -> TS_HAS_MODULE) to namespace the contract.

Breaking schema change; bump SCHEMA_VERSION.

[rahlk]

Superseded by a discrete decomposition: #8 (node labels), #9 (relationship types), #10 (contract version and artifact regeneration). Tracking moves to those issues; PR #7 closes them.