feat: allow requesting scopes when using ExchangedTokenRequestedEvent event

[saw-jan]

Allow requesting scope when using ExchangedTokenRequestedEvent event.

Usage:

$scopes = ["myscope1", "myscope2"];

$event = new ExchangedTokenRequestedEvent($targetAudience, $scopes);

Part of #1091

[saw-jan]

@julien-nc Could you review it?

[julien-nc]

Looks good. It would be nicer to pass the extra scopes as an array that would turned into a string in the end like implode(' ', $extraScopes). Wdyt?

[saw-jan]

Looks good. It would be nicer to pass the extra scopes as an array that would turned into a string in the end like implode(' ', $extraScopes). Wdyt?

That would also be nice. Let me change it to array. Thanks

[saw-jan]

Looks good. It would be nicer to pass the extra scopes as an array that would turned into a string in the end like implode(' ', $extraScopes). Wdyt?

Done!

[saw-jan]

@julien-nc Please merge this if okay to do so. I have no permissions to merge it

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