Feat: Add DynamicPrompt component #3221 (#8028)

### What problem does this PR solve?

Feat: Add DynamicPrompt component #3221

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/agent/form/agent-form/dynamic-prompt.tsx

@@ -0,0 +1,97 @@
+import { PromptEditor } from '@/components/prompt-editor';
+import { BlockButton, Button } from '@/components/ui/button';
+import {
+  FormControl,
+  FormField,
+  FormItem,
+  FormLabel,
+  FormMessage,
+} from '@/components/ui/form';
+import { RAGFlowSelect } from '@/components/ui/select';
+import { X } from 'lucide-react';
+import { memo } from 'react';
+import { useFieldArray, useFormContext } from 'react-hook-form';
+import { useTranslation } from 'react-i18next';
+
+export enum PromptRole {
+  User = 'user',
+  Assistant = 'assistant',
+}
+
+const options = [
+  { label: 'User', value: PromptRole.User },
+  { label: 'Assistant', value: PromptRole.Assistant },
+];
+
+const DynamicPrompt = () => {
+  const { t } = useTranslation();
+  const form = useFormContext();
+  const name = 'prompts';
+
+  const { fields, append, remove } = useFieldArray({
+    name: name,
+    control: form.control,
+  });
+
+  return (
+    <FormItem>
+      <FormLabel tooltip={t('flow.msgTip')}>{t('flow.msg')}</FormLabel>
+      <div className="space-y-4">
+        {fields.map((field, index) => (
+          <div key={field.id} className="flex">
+            <div className="space-y-2 flex-1">
+              <FormField
+                control={form.control}
+                name={`${name}.${index}.role`}
+                render={({ field }) => (
+                  <FormItem className="w-1/3">
+                    <FormLabel />
+                    <FormControl>
+                      <RAGFlowSelect
+                        {...field}
+                        options={options}
+                      ></RAGFlowSelect>
+                    </FormControl>
+                    <FormMessage />
+                  </FormItem>
+                )}
+              />
+
+              <FormField
+                control={form.control}
+                name={`${name}.${index}.content`}
+                render={({ field }) => (
+                  <FormItem className="flex-1">
+                    <FormControl>
+                      <section>
+                        <PromptEditor
+                          {...field}
+                          showToolbar={false}
+                        ></PromptEditor>
+                      </section>
+                    </FormControl>
+                  </FormItem>
+                )}
+              />
+            </div>
+            <Button
+              type="button"
+              variant={'ghost'}
+              onClick={() => remove(index)}
+            >
+              <X />
+            </Button>
+          </div>
+        ))}
+      </div>
+      <FormMessage />
+      <BlockButton
+        onClick={() => append({ content: '', role: PromptRole.User })}
+      >
+        Add
+      </BlockButton>
+    </FormItem>
+  );
+};
+
+export default memo(DynamicPrompt);