Use endpoint as default connection option (ADR-119)

[surminus]

This implements ADR-119[1], which specifies the client connection options to update requests to the endpoints implemented as part of ADR-042[2].

The endpoint may be one of the following:

• a routing policy name (such as main)
• a nonprod routing policy name (such as nonprod:sandbox)
• a FQDN such as foo.example.com

The endpoint option is not valid with any of environment, restHost or realtimeHost, but we still intend to support the legacy options.

If the client has been configured to use any of these legacy options, then they should continue to work in the same way, using the same primary and fallback hostnames.

If the client has not been explicitly configured, then the hostnames will change to the new ably.net domain when the package is upgraded.

Notes on implementation

As per previous guidance, I have not updated tests to use the endpoint client option, but since the hostnames are changing, then the assertions and default environment must be updated (from sandbox to nonprod:sandbox).

I have not added any explicit tests for the endpoint client option, but I can do this if we think it's necessary, although using environment is essentially the same as using endpoint.

See related Go (merged), Ruby and Python PRs:

• [ClientOption] Add support for endpoint according to new routing policy ably-go#679
• Use endpoint as default connection option (ADR-119) ably-ruby#441
• Use endpoint as default connection option (ADR-119) ably-python#590

[1] https://ably.atlassian.net/wiki/spaces/ENG/pages/3428810778/ADR-119+ClientOptions+for+new+DNS+structure
[2] https://ably.atlassian.net/wiki/spaces/ENG/pages/1791754276/ADR-042+DNS+Restructure

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