Extract SemanticVersion into its own crate (#9956)

This PR extracts the `SemanticVersion` out of `util` and into its own
`SemanticVersion` crate.

This allows for making use of `SemanticVersion` without needing to pull
in some of the heavier dependencies included in the `util` crate.

As part of this the public API for `SemanticVersion` has been tidied up
a bit.

Release Notes:

- N/A

crates/extension/src/wasm_host/wit.rs

@@ -4,8 +4,8 @@ mod v0_0_4;
 use super::{wasm_engine, WasmState};
 use anyhow::{Context, Result};
 use language::LspAdapterDelegate;
+use semantic_version::SemanticVersion;
 use std::sync::Arc;
-use util::SemanticVersion;
 use wasmtime::{
     component::{Component, Instance, Linker, Resource},
     Store,