reflectors: Track reflector state based on events

This work is not yet used anywhere (so cargo complains about that), it
will be used in upcoming commits.

Track the health of reflectors for monitoring them in Checkmk later:
- Has the reflector ever been initialized fully? (full list)
- When did the last relist start/end?
- How long did the last relist take?
- When was the last error?
- How many errors has the reflector ever seen?

Author: relrod

Cargo.lock

@@ -23,6 +23,7 @@ kube = { version = "4.0", features = ["ring", "runtime"] }
 moka = { version = "0.12.15", features = ["future"] }
 opentelemetry-proto = { version = "0.32", default-features = false, features = ["gen-tonic-messages", "metrics"] }
 os-release = { workspace = true }
+parking_lot = "0.12.5"
 prost = "0.14"
 rcgen = "0.14.8"
 regex = "1.12.4"