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.lock

@@ -459,6 +459,8 @@ GEM
     multi_json (1.15.0)
     multi_xml (0.6.0)
     multipart-post (2.3.0)
+    neighbor (0.2.3)
+      activerecord (>= 5.2)
     net-http-persistent (4.0.2)
       connection_pool (~> 2.2)
     net-imap (0.3.6)
@@ -532,6 +534,7 @@ GEM
     pg_search (2.3.6)
       activerecord (>= 5.2)
       activesupport (>= 5.2)
+    pgvector (0.1.1)
     procore-sift (1.0.0)
       activerecord (>= 6.1)
     pry (0.14.2)
@@ -617,6 +620,8 @@ GEM
       mime-types (>= 1.16, < 4.0)
       netrc (~> 0.8)
     retriable (3.1.2)
+    reverse_markdown (2.1.1)
+      nokogiri
     rexml (3.2.5)
     rspec-core (3.12.2)
       rspec-support (~> 3.12.0)
@@ -884,6 +889,7 @@ DEPENDENCIES
   lograge (~> 0.12.0)
   maxminddb
   mock_redis
+  neighbor
   newrelic-sidekiq-metrics
   newrelic_rpm
   omniauth
@@ -892,6 +898,7 @@ DEPENDENCIES
   omniauth-rails_csrf_protection (~> 1.0)
   pg
   pg_search
+  pgvector
   procore-sift
   pry-rails
   puma
@@ -905,6 +912,7 @@ DEPENDENCIES
   redis-namespace
   responders
   rest-client
+  reverse_markdown
   rspec-rails
   rspec_junit_formatter
   rubocop