feat(ws): set max number of websocket connections

[Trantorian1]

Is there an existing issue?

• I have searched the existing issues

Motivation

See #335 for more information about implementing rpc v0.8.0-rc0 in Madara.

Request

Add a cmd-line option to set the max number of websocket connections allowed in Madara, with the option for unlimited connections (defaults to a finite number of connections).

Note

Madara already provides the --rpc-max-request-size but this does not limit the number of ws connections, only their size.

Solution

Solution should be integrated into a separate param struct along with other websocket rpc arguments. See #342 and #343 for more information.

Are you willing to help with this request?

Yes!