Feat: add Airtable connector and integration for data synchronization (#12211)

### What problem does this PR solve?
change:
add Airtable connector and integration for data synchronization
### Type of change

- [x] New Feature (non-breaking change which adds functionality)

common/data_source/config.py

@@ -53,6 +53,7 @@ class DocumentSource(str, Enum):
     S3_COMPATIBLE = "s3_compatible"
     DROPBOX = "dropbox"
     BOX = "box"
+    AIRTABLE = "airtable"
 
 class FileOrigin(str, Enum):
     """File origins"""
@@ -251,6 +252,10 @@ WEB_CONNECTOR_IGNORED_ELEMENTS = os.environ.get(
     "WEB_CONNECTOR_IGNORED_ELEMENTS", "nav,footer,meta,script,style,symbol,aside"
 ).split(",")
 
+AIRTABLE_CONNECTOR_SIZE_THRESHOLD = int(
+    os.environ.get("AIRTABLE_CONNECTOR_SIZE_THRESHOLD", 10 * 1024 * 1024)
+)
+
 _USER_NOT_FOUND = "Unknown Confluence User"
 
 _COMMENT_EXPANSION_FIELDS = ["body.storage.value"]