Wasm-builder runtime-wasm feature (#6177)

* Enable the `runtime-wasm` for wasm builds

This enables the `runtime-wasm` feature for wasm builds. The feature is
not mandatory and will only be activated if it exists in the
`Cargo.toml`.

* Fix compilation

* Update docs

* Uprgade version

* Apply suggestions from code review

substrate/primitives/runtime-interface/test-wasm-deprecated/build.rs

@@ -20,7 +20,7 @@ use wasm_builder_runner::WasmBuilder;
 fn main() {
 	WasmBuilder::new()
 		.with_current_project()
-		.with_wasm_builder_from_crates_or_path("1.0.9", "../../../utils/wasm-builder")
+		.with_wasm_builder_from_crates_or_path("1.0.11", "../../../utils/wasm-builder")
 		.export_heap_base()
 		.import_memory()
 		.build()

substrate/primitives/runtime-interface/test-wasm/build.rs

@@ -20,7 +20,7 @@ use wasm_builder_runner::WasmBuilder;
 fn main() {
 	WasmBuilder::new()
 		.with_current_project()
-		.with_wasm_builder_from_crates_or_path("1.0.9", "../../../utils/wasm-builder")
+		.with_wasm_builder_from_crates_or_path("1.0.11", "../../../utils/wasm-builder")
 		.export_heap_base()
 		.import_memory()
 		.build()