Rename ExecutionMode to IsolationStrategy (#1932)

* Rename ExecutionMode to IsolationStrategy

Execution mode is too generic name and can imply a lot of different
aspects of execution. The notion of isolation better describes the
meant aspect.

And while I am at it, I also renamed mode -> strategy cause it seems a
bit more appropriate, although that is way more subjective.

* Fix compilation in wasm_executor tests.

* Add a comment to IsolationStrategy

* Update comments on IsolationStrategy

* Update node/core/candidate-validation/src/lib.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Accomodate the point on interruption

* Update parachain/src/wasm_executor/mod.rs

Co-authored-by: Andronik Ordian <write@reusable.software>

* Naming nits

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
Co-authored-by: Andronik Ordian <write@reusable.software>

polkadot/node/test/service/src/lib.rs

@@ -87,7 +87,7 @@ pub fn new_full(
 			query_start_delay: Duration::from_secs(0),
 			..Default::default()
 		}),
-		polkadot_parachain::wasm_executor::ExecutionMode::InProcess,
+		polkadot_parachain::wasm_executor::IsolationStrategy::InProcess,
 	).map_err(Into::into)
 }