Additional setting to disable password options in security dialog and lobby page

[dimitardelchev93]

Add an additional configuration setting to jitsi-meet, when this setting has a true value, the lobby page "Enter meeting password" button must be hidden hidden, and there must not be a "Add password" option in security dialog.

Some meetings need to have a controlled access (with JWT tokens as an example) and having the ability to add password to the meeting is not needed or wanted.

Setting description in config.js:

// Disables password features
// disableMeetingPassword: false,

Add password option location:

Lobby password button location:

[saghul]

A PR would be welcome, disables by default of course.

[github-actions[bot]]

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