Add exclusions for match arm/guard mutants

cargo-mutants 25.0.1  introduced a new mutation pattern that deletes an
arm of a match statement or replaces a match guard with true and false.
These are applied in sections that have been excluded from mutation
testing and cause false positives.
The match patterns are also now stricter causing previously excluded
`impl` to be included.

Exclude the new match arm and guard mutation patterns.

Add `impl fmt::` versions for Debug and Display.

.cargo/mutants.toml

@@ -4,12 +4,15 @@ exclude_globs = [
     "units/src/amount/verification.rs" # kani tests
 ]
 exclude_re = [
-    "impl Debug",
     "impl Arbitrary",
+    "impl Debug",
+    "impl fmt::Debug",
     "impl Display",
+    "impl fmt::Display",
     ".*Error",
     "deserialize", # Skip serde mutation tests
     "Iterator", # Mutating operations in an iterator can result in an infinite loop
+    "match arm", "match guard", # New addition in cargo-mutants 25.0.1 deletes match arms and replaces match guards even in excluded functions
 
     # ----------------------------------Crate-specific exclusions----------------------------------
     # Units