chore: output versions of Rust tools on CI

New mise command: `mise rust:version`

It is run during CI and can also be invoked locally.

It will output something like this:

```
$ mise run rust:version
[rust:version] $ echo "rustc --version         = " $(rustc --version)
rustc --version         =  rustc 1.86.0 (05f9846f8 2025-03-31)
cargo --version         =  cargo 1.86.0 (adf9b6ad1 2025-02-28)
cargo fmt --version     =  rustfmt 1.8.0-stable (05f9846f89 2025-03-31)
cargo clippy --version  =  clippy 0.1.86 (05f9846f89 2025-03-31)
```

Very handy to verify that your local toolchain is the same as CI when
rustfmt is failing the build but is fine locally.

Author: freshtonic

mise.toml

@@ -108,6 +108,7 @@ run = "docker compose rm --stop --force proxy proxy-tls"
 alias = ['t', 'ci']
 description = "Runs all tests (hygiene, unit, integration)"
 run = """
+mise run rust:version
 mise run test:check
 mise run test:format
 mise run test:clippy
@@ -369,6 +370,15 @@ mise --env tls run proxy:down
 description = "Runs cargo nextest, skipping integration tests"
 run = 'cargo nextest run --no-fail-fast --nocapture -E "not package(cipherstash-proxy-integration)" {{arg(name="test",default="")}}'
 
+[tasks."rust:version"]
+description = "Outputs rust toolchain version info"
+run = """
+echo "rustc --version         = " $(rustc --version)
+echo "cargo --version         = " $(cargo --version)
+echo "cargo fmt --version     = " $(cargo fmt --version)
+echo "cargo clippy --version  = " $(cargo clippy --version)
+"""
+
 [tasks."test:format"]
 description = "Runs cargo fmt"
 run = 'cargo fmt --all -- --check'