Provide the API version for TS' HttpTunnelManagementClient as an enumeration

[connor4312]

The valid versions of the apiVersion passed into the HttpTunnelManagementClient are checked at runtime and an error is thrown if invalid

dev-tunnels/ts/src/management/tunnelManagementHttpClient.ts

Lines 142 to 144 in 2f315dc

	if (apiVersions.indexOf(apiVersion) === -1) {
	throw new TypeError(`Invalid API version: ${apiVersion}, must be one of ${apiVersions}`);
	}

It would be less error-prone if API vesions were exposed as a type (e.g. an enum or union of string types) so that they can be checked at compile-time.

This led to some confusion in https://github.com/microsoft/vscode-remote-tunnels/pull/709#discussion_r1416362126

[derekbekoe]

@jfullerton44 can this be done?

[jfullerton44]

PR created https://github.com/microsoft/dev-tunnels/pull/373/files