feat(whatsapp): 🎉 Add extended sending and template management

* Implemented new endpoints for sending various message types:
  - Audio
  - Sticker
  - Location
  - Contacts
  - Interactive messages
  - Template messages
  - Flow messages
  - Reactions
  - Marking messages as read

* Added template management endpoints:
  - List templates
  - Upload templates
  - Delete templates

* Introduced flow management endpoints:
  - List flows
  - Create flows
  - Get flow details
  - Upload flow assets
  - Publish flows
  - Delete flows

* Added phone number management endpoints:
  - List phone numbers
  - Request verification code
  - Verify code

* Enhanced media management with delete media endpoint.

* Updated dependencies.

pkg/whatsapp/businessapi/templates.go

@@ -0,0 +1,50 @@
+package businessapi
+
+import (
+	"context"
+	"net/url"
+)
+
+// ListTemplates returns all message templates for the business account.
+// Requires BusinessAccountID in the client config.
+func (c *Client) ListTemplates(ctx context.Context) (*TemplateListResponse, error) {
+	if c.config.BusinessAccountID == "" {
+		return nil, errNoBusinessAccount
+	}
+
+	params := url.Values{
+		"fields": {"id,name,status,language,category,created_at,components,rejection_reasons,quality_score"},
+	}
+
+	var resp TemplateListResponse
+	if err := c.graphAPIGet(ctx, c.config.BusinessAccountID+"/message_templates", params, &resp); err != nil {
+		return nil, err
+	}
+	return &resp, nil
+}
+
+// UploadTemplate creates a new message template.
+func (c *Client) UploadTemplate(ctx context.Context, tmpl TemplateUploadRequest) (*TemplateUploadResponse, error) {
+	if c.config.BusinessAccountID == "" {
+		return nil, errNoBusinessAccount
+	}
+
+	var resp TemplateUploadResponse
+	if err := c.graphAPIPost(ctx, c.config.BusinessAccountID+"/message_templates", tmpl, &resp); err != nil {
+		return nil, err
+	}
+	return &resp, nil
+}
+
+// DeleteTemplate deletes a template by name and language.
+func (c *Client) DeleteTemplate(ctx context.Context, name, language string) error {
+	if c.config.BusinessAccountID == "" {
+		return errNoBusinessAccount
+	}
+
+	params := url.Values{
+		"name":     {name},
+		"language": {language},
+	}
+	return c.graphAPIDelete(ctx, c.config.BusinessAccountID+"/message_templates", params)
+}