Add support for httpResource API

templates/fn.handlebars

@@ -2,7 +2,7 @@
 /* eslint-disable */
 /* Code generated by ng-openapi-gen DO NOT EDIT. */
 
-import { HttpClient, HttpContext, HttpResponse } from '@angular/common/http';
+import { HttpClient, HttpContext, HttpResponse, httpResource, HttpResourceRef, HttpResourceOptions } from '@angular/common/http';
 import { Observable } from 'rxjs';
 import { filter, map } from 'rxjs/operators';
 import { {{@root.responseClass}} } from '{{pathToRoot}}{{@root.responseFile}}';
@@ -20,7 +20,13 @@ export interface {{paramsType}} {
 {{/requestBody}}
 }
 
-export function {{importName}}(http: HttpClient, rootUrl: string, params{{^operation.parametersRequired}}?{{/operation.parametersRequired}}: {{paramsType}}, context?: HttpContext): Observable<{{@root.responseClass}}<{{{resultType}}}>> {
+export const {{importName}} = {
+  Obs: {{importName}}$Obs,
+  Signal: {{importName}}$Signal,
+  PATH: '{{{operation.path}}}'
+};
+
+export function {{importName}}$Obs(http: HttpClient, rootUrl: string, params{{^operation.parametersRequired}}?{{/operation.parametersRequired}}: {{paramsType}}, context?: HttpContext): Observable<{{@root.responseClass}}<{{{resultType}}}>> {
   const rb = new {{@root.requestBuilderClass}}(rootUrl, {{importName}}.PATH, '{{operation.method}}');
   if (params) {
 {{#operation.parameters}}
@@ -41,4 +47,21 @@ export function {{importName}}(http: HttpClient, rootUrl: string, params{{^opera
   );
 }
 
-{{importName}}.PATH = '{{{operation.path}}}';
+
+export function {{importName}}$Signal(http: HttpClient, rootUrl: string, paramsCallback{{^operation.parametersRequired}}?{{/operation.parametersRequired}}: () => {{paramsType}} | undefined, httpResourceOptions?: HttpResourceOptions<{{{resultType}}} | undefined, unknown>, context?: HttpContext): HttpResourceRef<{{{resultType}}} | undefined> {
+  return httpResource(() => {
+    let params = paramsCallback ? paramsCallback() : undefined;
+    const rb = new {{@root.requestBuilderClass}}(rootUrl, {{importName}}.PATH, '{{operation.method}}');
+    if (params) {
+  {{#operation.parameters}}
+      rb.{{in}}('{{{name}}}', params{{{varAccess}}}, {{{parameterOptions}}});
+  {{/operation.parameters}}
+  {{#requestBody}}
+      rb.body(params.body, '{{{mediaType}}}');
+  {{/requestBody}}
+    } else {
+      return undefined;
+    }
+    return rb.build({ responseType: '{{{responseType}}}', accept: '{{{accept}}}', context })
+  }, httpResourceOptions);
+}

templates/operationBody.handlebars

@@ -3,3 +3,7 @@
       map((r: {{@root.responseClass}}<{{{resultType}}}>): {{{resultType}}} => r.body)
     );
   }
+
+  {{{bodyMethodTsComments}}}{{methodName}}$Signal({{>operationParametersSignal}}): HttpResourceRef<{{{resultType}}} | undefined> {
+    return {{importName}}.Signal(this.http, this.rootUrl, params, httpResourceOptions, context)
+  }

templates/operationParametersSignal.handlebars

@@ -0,0 +1 @@
+params{{^operation.parametersRequired}}?{{/operation.parametersRequired}}: () => {{paramsType}} | undefined, httpResourceOptions?: HttpResourceOptions<{{{resultType}}} | undefined, unknown>, context?: HttpContext

templates/operationResponse.handlebars

@@ -1,3 +1,3 @@
 {{{responseMethodTsComments}}}{{responseMethodName}}({{>operationParameters}}): Observable<{{@root.responseClass}}<{{{resultType}}}>> {
-    return {{importName}}(this.http, this.rootUrl, params, context);
-  }
+    return {{importName}}.Obs(this.http, this.rootUrl, params, context);
+  }

templates/service.handlebars

@@ -2,7 +2,7 @@
 /* eslint-disable */
 /* Code generated by ng-openapi-gen DO NOT EDIT. */
 
-import { HttpClient, HttpContext } from '@angular/common/http';
+import { HttpClient, HttpContext, HttpResourceRef, HttpResourceOptions } from '@angular/common/http';
 import { Injectable } from '@angular/core';
 import { Observable } from 'rxjs';
 import { map } from 'rxjs/operators';