Migrate credential-library nomenclature around targets to credential-source (#1413)

See the CHANGELOG entry for more information.

Co-authored-by: Jim <jlambert@hashicorp.com>

Co-authored-by: Michael Gaffney <mgaffney@users.noreply.github.com>

internal/api/genapi/input.go

@@ -559,6 +559,10 @@ var inputStructs = []*structInfo{
 		inProto: &targets.CredentialLibrary{},
 		outFile: "targets/credential_library.gen.go",
 	},
+	{
+		inProto: &targets.CredentialSource{},
+		outFile: "targets/credential_source.gen.go",
+	},
 	{
 		inProto: &targets.SessionSecret{},
 		outFile: "targets/session_secret.gen.go",
@@ -606,6 +610,7 @@ var inputStructs = []*structInfo{
 				VarName:   "hostSetIds",
 			},
 			"CredentialLibraries": {},
+			"CredentialSources":   {},
 		},
 		extraOptions: []fieldInfo{
 			{
@@ -631,6 +636,11 @@ var inputStructs = []*structInfo{
 				ProtoName: "application_credential_library_ids",
 				FieldType: "[]string",
 			},
+			{
+				Name:      "ApplicationCredentialSourceIds",
+				ProtoName: "application_credential_source_ids",
+				FieldType: "[]string",
+			},
 		},
 		versionEnabled:      true,
 		typeOnCreate:        true,