feat: Response Bot using GPT and Webpage Sources (#7518)

This commit introduces the ability to associate response sources to an inbox, allowing external webpages to be parsed by Chatwoot. The parsed data is converted into embeddings for use with GPT models when managing customer queries.

The implementation relies on the `pgvector` extension for PostgreSQL. Database migrations related to this feature are handled separately by `Features::ResponseBotService`. A future update will integrate these migrations into the default rails migrations, once compatibility with Postgres extensions across all self-hosted installation options is confirmed.

Additionally, a new GitHub action has been added to the CI pipeline to ensure the execution of specs related to this feature.

Gemfile

@@ -165,6 +165,13 @@ gem 'omniauth'
 gem 'omniauth-google-oauth2'
 gem 'omniauth-rails_csrf_protection', '~> 1.0'
 
+## Gems for reponse bot
+# adds cosine similarity to postgres using vector extension
+gem 'neighbor'
+gem 'pgvector'
+# Convert Website HTML to Markdown
+gem 'reverse_markdown'
+
 # Sentiment analysis
 gem 'informers'