chore: Add clippy lints (#529)

Lints are added (deny) at crate level.

In each offending file, the failing lints are explicitly allowed.
Each file will be fixed in subsequent PRs.

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

src/target/deserialize.rs

@@ -1,6 +1,8 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 
+#![allow(clippy::unused_trait_names)]
+
 use crate::registry::instances::{EFFECT_SCHEMA_REGISTRY, RESOURCE_SCHEMA_REGISTRY};
 use crate::{format, Rc, Schema, Vec};
 use alloc::collections::BTreeMap;

src/target/resource_schema_selector.rs

@@ -1,6 +1,8 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 
+#![allow(clippy::option_if_let_else, clippy::pattern_type_mismatch)]
+
 use crate::schema::Type;
 use crate::{format, Rc, Schema, Value};
 use alloc::collections::BTreeMap;

src/target/tests/deserialize.rs

@@ -1,6 +1,8 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 
+#![allow(clippy::unwrap_used, clippy::unused_trait_names)] // tests unwrap intentional failures and import ToString anonymously
+
 use super::super::*;
 use crate::Value;
 use alloc::string::ToString;