Add test cases for bitwise not for decimal type

cases/arithmetic_decimal/bitwise_not_decimal.yaml

@@ -0,0 +1,75 @@
+base_uri: https://github.com/substrait-io/substrait/blob/main/extensions/substrait/extensions/functions_arithmetic_decimal.yaml
+function: bitwise_not
+cases:
+  - group:
+      id: basic
+      description: Basic examples without any special cases
+    args:
+      - value: 0
+        type: decimal<38, 0>
+    result:
+      value: -1
+      type: decimal<38, 0>
+  - group: basic
+    args:
+      - value: 1
+        type: decimal<38, 0>
+    result:
+      value: -2
+      type: decimal<38, 0>
+  - group: basic
+    args:
+      - value: -127
+        type: decimal<38, 0>
+    result:
+      value: 126
+      type: decimal<38, 0>
+  - group: basic
+    args:
+      - value: 31766
+        type: decimal<38, 0>
+    result:
+      value: -31767
+      type: decimal<38, 0>
+  - group: basic
+    args:
+      - value: -31766
+        type: decimal<38, 0>
+    result:
+      value: 31765
+      type: decimal<38, 0>
+  - group: basic
+    args:
+      - value: 2147483647
+        type: decimal<38, 0>
+    result:
+      value: -2147483648
+      type: decimal<38, 0>
+  - group: basic
+    args:
+      - value: 2147483647
+        type: decimal<38, 0>
+    result:
+      value: -2147483648
+      type: decimal<38, 0>
+  - group: basic
+    args:
+      - value: 9223372036854775807
+        type: decimal<38, 0>
+    result:
+      value: -9223372036854775808
+      type: decimal<38, 0>
+  - group: basic
+    args:
+      - value: -9223372036854775807
+        type: decimal<38, 0>
+    result:
+      value: 9223372036854775806
+      type: decimal<38, 0>
+  - group: basic
+    args:
+      - value: null
+        type: decimal<38, 0>
+    result:
+      value: null
+      type: decimal<38, 0>

dialects/snowflake.yaml

@@ -372,3 +372,8 @@ aggregate_functions:
   aggregate: true
   supported_kernels:
   - bool
+- name: arithmetic_decimal.bitwise_not
+  local_name: bitnot
+  required_options:
+  supported_kernels:
+    - dec