feat: Add twilio content templates (#12277)
Implements comprehensive Twilio WhatsApp content template support (Phase
1) enabling text, media, and quick reply templates with proper parameter
conversion, sync capabilities, and feature flag protection.
### Features Implemented
**Template Types Supported**
- Basic Text Templates: Simple text with variables ({{1}}, {{2}})
- Media Templates: Image/Video/Document templates with text variables
- Quick Reply Templates: Interactive button templates
- Phase 2 (Future): List Picker, Call-to-Action, Catalog, Carousel,
Authentication templates
**Template Synchronization**
- API Endpoint: POST
/api/v1/accounts/{account_id}/inboxes/{inbox_id}/sync_templates
- Background Job: Channels::Twilio::TemplatesSyncJob
- Storage: JSONB format in channel_twilio_sms.content_templates
- Auto-categorization: UTILITY, MARKETING, AUTHENTICATION categories
### Template Examples Tested
#### Text template
```
{ "name": "greet", "language": "en" }
```
#### Template with variables
```
{ "name": "order_status", "parameters": [{"type": "body", "parameters": [{"text": "John"}]}] }
```
#### Media template with image
```
{ "name": "product_showcase", "parameters": [
{"type": "header", "parameters": [{"image": {"link": "image.jpg"}}]},
{"type": "body", "parameters": [{"text": "iPhone"}, {"text": "$999"}]}
]}
```
#### Preview
<img width="1362" height="1058" alt="CleanShot 2025-08-26 at 10 01
51@2x"
src="https://github.com/user-attachments/assets/cb280cea-08c3-44ca-8025-58a96cb3a451"
/>
<img width="1308" height="1246" alt="CleanShot 2025-08-26 at 10 02
02@2x"
src="https://github.com/user-attachments/assets/9ea8537a-61e9-40f5-844f-eaad337e1ddd"
/>
#### User guide
https://www.chatwoot.com/hc/user-guide/articles/1756195741-twilio-content-templates
---------
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>
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