Revamp errors in `aws-smithy-json` (#1888)

aws/rust-runtime/aws-config/src/json_credentials.rs

...azon/smithy/rust/codegen/core/smithy/protocols/AwsJson.kt

...zon/smithy/rust/codegen/core/smithy/protocols/RestJson.kt

...odegen/core/smithy/protocols/parse/JsonParserGenerator.kt

...rver/smithy/protocols/ServerHttpBoundProtocolGenerator.kt

rust-runtime/aws-smithy-http-server/src/rejection.rs

rust-runtime/aws-smithy-json/src/deserialize.rs

rust-runtime/aws-smithy-json/src/deserialize/error.rs

rust-runtime/aws-smithy-json/src/deserialize/token.rs

rust-runtime/aws-smithy-json/src/escape.rs

rust-runtime/inlineable/src/endpoint_lib/partition.rs

rust-runtime/inlineable/src/json_errors.rs