feat(kvp): add ProvisioningReport abstraction over KvpPoolStore (#310)

* feat(kvp): add ProvisioningReport abstraction over KvpPoolStore

Add a ProvisioningReport that converts to ordered KVP
entries via a new ToKvp trait and persists with write_report. ToKvp is
the seam for a future diagnostics report to reuse write_report unchanged.

* fix(kvp): match legacy field order and add typed ReportPpsType

Branch ProvisioningReport::encode per outcome so success extras trail
the standard fields (failure layout unchanged), require a typed
ReportPpsType on the constructors, rename error() -> failure(), and mark
ReportPpsType non_exhaustive. Adds layout and pps_type wire-string tests.

* feat(kvp): make report vm-id optional, default agent, add --supporting-data

* test(kvp): cover VM ID fallback and comma-aware supporting-data parsing

Close the codecov gaps on the new CLI paths and rework
--supporting-data so one flag can carry multiple comma-separated
pairs, including values that contain literal commas.

Author: peytonr18

libazureinit-kvp/Cargo.toml

@@ -9,10 +9,13 @@ license = "MIT"
 description = "Hyper-V KVP (Key-Value Pair) storage library for azure-init."
 
 [dependencies]
+chrono = { version = "0.4", default-features = false, features = ["clock", "std"] }
 clap = { version = "4.5.21", features = ["derive"] }
+csv = "1"
 libc = "0.2"
 serde_json = "1.0.96"
 tracing = "0.1.40"
+uuid = "1.3"
 
 [dev-dependencies]
 rstest = { version = "0.26", default-features = false }