[Feat] SSE client cleanup with DEFAULT_MAX_SSE_CLIENTS

[notixor]

DEFAULT_MAX_SSE_CLIENTS in AsyncEventSource.h not used anywhere

[mathieucarbou]

You're totally right: this fork is based on:

• https://github.com/yubox-node-org/ESPAsyncWebServer
• https://github.com/esphome/ESPAsyncWebServer

DEFAULT_MAX_SSE_CLIENTS was added by ESPHome guys, and looking at it, even now, they just added it but they do not use it.

I think they wanted to implement a cleanup procedure like it is done in the websocket part.

Feel free to contribute and add this feature! Like said, since I do not have any SSE use case at hand, if there's no contributions, this part will not be improved.

[github-actions[bot]]

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