add NAT to initialisms (#245)

Issue #, if available: N/A

Description of changes:
* Adds `NAT` to initialism with preventions

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

pkg/names/names.go

@@ -109,6 +109,8 @@ var (
 		{"Kms", "KMS", "kms", nil},
 		{"Ldap", "LDAP", "ldap", nil},
 		{"Mfa", "MFA", "mfa", nil},
+		// Prevent "Native" from becoming "NATive"
+		{"Nat", "NAT", "nat", regexp.MustCompile("Nat(?!i)", regexp.None)},
 		{"Oidc", "OIDC", "oidc", nil},
 		{"Sdk", "SDK", "sdk", nil},
 		{"Sha256", "SHA256", "sha256", nil},

pkg/names/names_test.go

@@ -67,6 +67,9 @@ func TestNames(t *testing.T) {
 		{"Ecmp", "ECMP", "ecmp", "ecmp"},
 		{"Ena", "ENA", "ena", "ena"},
 		{"UUID", "UUID", "uuid", "uuid"},
+		{"Nat", "NAT", "nat", "nat"},
+		{"NatGateway", "NATGateway", "natGateway", "nat_gateway"},
+		{"NativeAuditFieldsIncluded", "NativeAuditFieldsIncluded", "nativeAuditFieldsIncluded", "native_audit_fields_included"},
 	}
 	for _, tc := range testCases {
 		n := names.New(tc.original)