feat: APIs for Integration Hooks (#2250)

- Introduces JSON Schema validations via JSONSchemer
- Add CRUD APIs for integration hooks

Gemfile.lock

@@ -181,6 +181,8 @@ GEM
     dotenv-rails (2.7.6)
       dotenv (= 2.7.6)
       railties (>= 3.2)
+    ecma-re-validator (0.2.1)
+      regexp_parser (~> 1.2)
     equalizer (0.0.11)
     erubi (1.10.0)
     et-orbi (1.2.4)
@@ -292,6 +294,11 @@ GEM
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
     json (2.3.1)
+    json_schemer (0.2.16)
+      ecma-re-validator (~> 0.2)
+      hana (~> 1.3)
+      regexp_parser (~> 1.5)
+      uri_template (~> 0.7)
     jwt (2.2.3)
     kaminari (1.2.1)
       activesupport (>= 4.1.0)
@@ -568,6 +575,7 @@ GEM
     unf_ext (0.0.7.7)
     unicode-display_width (1.7.0)
     uniform_notifier (1.13.0)
+    uri_template (0.7.0)
     valid_email2 (3.3.1)
       activemodel (>= 3.2)
       mail (~> 2.5)
@@ -641,6 +649,7 @@ DEPENDENCIES
   hashie
   jbuilder
   json_refs!
+  json_schemer
   jwt
   kaminari
   koala