refactor(java): dynamically match wasm-bindgen host functions by prefix

[aepfli]

Summary

• WasmRuntime.java now inspects the WASM module's import section at startup and registers host function handlers by prefix pattern matching, instead of hardcoding 9 function names with wasm-bindgen hash suffixes
• HOST_FUNCTIONS.md rewritten to document all 9 WASM imports across 3 modules, with dynamic matching examples for Java, Go, and JavaScript

Motivation

wasm-bindgen generates function names with hash suffixes (e.g., __wbg_getTime_ad1e9878a735af08) that change whenever Rust dependencies or wasm-bindgen versions update. This has broken CI in multiple PRs (#64). By matching imports by prefix (__wbg_getTime_*) instead of exact name, the Java integration survives dependency changes without code updates.

How it works

1. Load the WASM module via CompiledEvaluator.load()
2. Iterate importSection().stream() to discover all FunctionImports
3. Match each import by module + name prefix to the appropriate handler
4. Register handlers dynamically in the Chicory Store

Test plan

• All 30 Java tests pass (./mvnw test)
• WASM binary imports verified via wasm-objdump
• No Rust code changes required

Closes #74

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