Add support new version of Slack applocation

- Added support of Event API in socketMode
- Fix files upload for new applications

vendor/github.com/slack-go/slack/socketmode/request.go

@@ -0,0 +1,38 @@
+package socketmode
+
+import "encoding/json"
+
+// Request maps to the content of each WebSocket message received via a Socket Mode WebSocket connection
+//
+// We call this a "request" rather than e.g. a WebSocket message or an Socket Mode "event" following python-slack-sdk:
+//
+// https://github.com/slackapi/python-slack-sdk/blob/3f1c4c6e27bf7ee8af57699b2543e6eb7848bcf9/slack_sdk/socket_mode/request.py#L6
+//
+// We know that node-slack-sdk calls it an "event", that makes it hard for us to distinguish our client's own event
+// that wraps both internal events and Socket Mode "events", vs node-slack-sdk's is for the latter only.
+//
+// https://github.com/slackapi/node-slack-sdk/blob/main/packages/socket-mode/src/SocketModeClient.ts#L537
+type Request struct {
+	Type string `json:"type"`
+
+	// `hello` type only
+	NumConnections int            `json:"num_connections"`
+	ConnectionInfo ConnectionInfo `json:"connection_info"`
+
+	// `disconnect` type only
+
+	// Reason can be "warning" or else
+	Reason string `json:"reason"`
+
+	// `hello` and `disconnect` types only
+	DebugInfo DebugInfo `json:"debug_info"`
+
+	// `events_api` type only
+	EnvelopeID string `json:"envelope_id"`
+	// TODO Can it really be a non-object type?
+	// See https://github.com/slackapi/python-slack-sdk/blob/3f1c4c6e27bf7ee8af57699b2543e6eb7848bcf9/slack_sdk/socket_mode/request.py#L26-L31
+	Payload                json.RawMessage `json:"payload"`
+	AcceptsResponsePayload bool            `json:"accepts_response_payload"`
+	RetryAttempt           int             `json:"retry_attempt"`
+	RetryReason            string          `json:"retry_reason"`
+}