feat(truapi): add testing API and versioned wiring

[pgherveou]

Adds the canonical testing module (api/testing.rs) and its v01/v02/versioned wiring used by the Rust host runtime and generated clients.

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Stack

Part of the Rust core runtime port (umbrella: #104), split into a reviewable stack. Merge bottom-up.

1. feat(truapi): add testing API and versioned wiring #248 — truapi: testing API + versioned wiring 👈
2. feat(truapi-platform): add host capability traits #249 — truapi-platform: host capability traits
3. feat(truapi-codegen): emit Rust dispatcher, wire table, and host callbacks #254 — truapi-codegen: Rust dispatcher + wire table
4. feat(truapi-server): add host logic primitives #255 — truapi-server: host logic primitives
5. feat(truapi-server): add wire and chain infrastructure #256 — truapi-server: wire and chain infrastructure
6. feat(truapi-server): add platform runtime and host bridge #250 — truapi-server: platform runtime and host bridge
7. feat(host-wasm): add @parity/truapi-host-wasm runtime #252 — host-wasm: @parity/truapi-host-wasm runtime
8. chore: docs, CI, tooling, and dotli integration for the Rust core #253 — docs, CI, tooling, dotli integration

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​@​polkadot-api/​utils@​0.1.2 ⏵ 0.4.0			-1	-1
	npm/​@​polkadot-api/​substrate-bindings@​0.12.0 ⏵ 0.20.2	+1		+1
	npm/​@​polkadot-api/​metadata-builders@​0.14.2
	npm/​@​parity/​truapi@​0.3.1 ⏵ 0.0.0	+21		+1	+7

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