fuzz: Add basic fuzzing of Scope #771

fuzz: Add basic fuzzing of Scope

Usage Workflow file

15 warnings

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Test: src/eval/mod.rs#L21

unused import: `CallStackFrame`

Test: src/func/mod.rs#L34

unused import: `shared_try_take`

Test: src/parser.rs#L21

unused import: `FnArgsVec`

`rhai` (lib test) generated 3 warnings (3 duplicates)

Test: tests/var_scope.rs#L1

unused imports: `Dynamic`, `Module`

Test: tests/math.rs#L1

unused import: `EvalAltResult`

`rhai` (test "var_scope") generated 1 warning (run `cargo fix --test "var_scope"` to apply 1 suggestion)

Test: examples/definitions/main.rs#L17

variable does not need to be mutable

`rhai` (example "definitions") generated 1 warning (run `cargo fix --example "definitions"` to apply 1 suggestion)

Test: tests/packages.rs#L2

unused imports: `Engine`, `INT`, `Module`, `Scope`, `def_package`

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