feat(utils): the utils now contain a service that wraps around the BroadcastChannel API

[DenisValcke]

This PR adds the BroadcastChannelService to the utils. This service wraps around the BroadcastChannel API:
https://developer.mozilla.org/en-US/docs/Web/API/Broadcast_Channel_API

[IbenTesara]

A few comments, mostly to keep it in line with the other packages.

Maybe also update the tags in the package.json?

[IbenTesara]

Here as well, I'd expect an error not a warn. I'd also refer to the initChannel method here.

[ian-emsens-shd]

Service does not implement the whole spec and lacks automatic type inference. Comment about constructor argument signature also applies to function parameters to a lesser extent.

[DenisValcke]

To recap the feedback into a todo list:

• Add tags to the package.json in line with the other packages
• Add the service to the global README of the ngx-utils
• Fix a typo in the service's README: it takes SSR into account
• Simplify the checks to see if the channelName is provided and exists within the Record
• Fix the selectChannel method mismatch with the documentation
• Convert console.warn messages to console.error and format the messages to be in line with others
• Rework the constructor to be more future proof for multiple arguments
• Add a method for the messageerror event to fully support the spec
• OPTIONAL: use the window service to check if the platform is browser

Additional:

• Rename BroadcastChannelService to NgxBroadcastChannelService to match other services

[DenisValcke]

All feedback has been processed (see checklist).

[IbenTesara]

Still one BroadcastChannelService instead of NgxBroadcastChannelService in the general docs but looks good to me!

[DenisValcke]

• Update the NgxBroadcastChannelService README to reflect recent changes
• Update the NgxUtils README to reflect recent changes