Feature: Enable Fragmentation for Text Frames in WebSocket Gateway

[SmySmy]

Currently, only single frame messages can be processed by the WebSocket Gateway. Fragmentation of frames is not implemented.
This should be changed with this feature.

This feature should implements the fragmentation for text frames. This process is defined in https://www.rfc-editor.org/rfc/rfc6455#section-5.4

"""
A fragmented message consists of a single frame with the FIN bit clear and an opcode other than 0, followed by zero or more frames with the FIN bit clear and the opcode set to 0, and terminated by a single frame with the FIN bit set and an opcode of 0.
"""