feat!: add cooperative execution-time limits across engine, VM, and binding (#539)

- Introduce ExecutionTimer/ExecutionTimerConfig to allow limiting evaluating time.
- To amortize time checking costs, checking interval can be configured via the notion of work units
- A global fallback time limit can be set to universally limit all evaluation in addition to engine level limit setting.
- Implement limnits in interpreter and RVM. In RVM, also handle suspend/resume so that time during pause is not counted.
- Add engine-level APIs to set/clear per-engine timer configuration and apply global fallback defaults.
- Surface execution-time limits through FFI and C# bindings
- Add C# tests and example usage to validate engine overrides, global fallback behavior, and compiled policy enforcement.
- Expand docs for execution-time limit
- Add interpreter YAML cases and VM unit tests for time-limit behavior and deterministic time sources.

Signed-off-by: Anand Krishnamoorthi <anakrish@microsoft.com>

bindings/ffi/Cargo.lock

@@ -153,9 +153,9 @@ checksum = "175812e0be2bccb6abe50bb8d566126198344f707e304f45c648fd8f2cc0365e"
 
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 [[package]]
 name = "iana-time-zone"
@@ -973,6 +973,7 @@ dependencies = [
  "serde",
  "serde_json",
  "serde_yaml",
+ "spin",
  "thiserror",
  "url",
  "uuid",
@@ -1071,11 +1072,11 @@ dependencies = [
 
 [[package]]
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+ "serde_core",
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 [[package]]
@@ -1109,6 +1110,12 @@ version = "1.15.1"
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 checksum = "67b1b7a3b5fe4f1376887184045fcf45c69e92af734b7aaddc05fb777b6fbd03"
 
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+
 [[package]]
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@@ -1188,44 +1195,42 @@ dependencies = [
 
 [[package]]
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 dependencies = [
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- "serde",
+ "serde_core",
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+ "toml_parser",
+ "toml_writer",
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 [[package]]
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-version = "0.1.2"
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+checksum = "92e1cfed4a3038bc5a127e35a2d360f145e1f4b971b551a2ba5fd7aedf7e1347"
+dependencies = [
+ "serde_core",
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+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a3198b4b0a8e11f09dd03e133c0280504d0801269e9afa46362ffde1cbeebf44"
+dependencies = [
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 [[package]]
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 [[package]]
 name = "wit-bindgen"