Feat: Cloud connection arguments

[quinchs]

Summary

This PR adds support for connecting to cloud instances, in short:

• EdgeDBConnection.Parse resolves cloud instance names from both instance and dsn parameters.
• EdgeDBBinaryClient will send secret_key parameter in the ClientHandshake message if its present in the EdgeDBConnection.
• Cloud instance name parsing is handled by this method:

  edgedb-net/src/EdgeDB.Net.Driver/EdgeDBConnection.cs

  Lines 470 to 520 in b3f56e6

  	private void ParseCloudInstanceName(string name)
  	{
  	if(name.Length > DOMAIN_NAME_MAX_LEN)
  	{
  	throw new ConfigurationException($"Cloud instance name must be {DOMAIN_NAME_MAX_LEN} characters or less");
  	}
  	string? secretKey = SecretKey;
  	if(secretKey is null)
  	{
  	var profile = ConfigUtils.ReadCloudProfile(CloudProfile);
  	if (profile.SecretKey is null)
  	{
  	throw new ConfigurationException("Secret key cannot be null");
  	}
  	secretKey = profile.SecretKey;
  	}
  	var spl = secretKey.Split('.');
  	if(spl.Length < 2)
  	{
  	throw new ConfigurationException("Invalid secret key: does not contain payload");
  	}
  	var json = Convert.FromBase64String(spl[1]);
  	var jsonData = JsonConvert.DeserializeObject<Dictionary<string, object?>>(Encoding.UTF8.GetString(json))!;
  	if(!jsonData.TryGetValue("iss", out var dnsZone))
  	{
  	throw new ConfigurationException("Invalid secret key: payload does not contain 'iss' value");
  	}
  	// safe: checks name length above to be less than DOMAIN_NAME_MAX_LEN
  	Span<byte> instanceNameBuffer = stackalloc byte[name.Length];
  	Encoding.UTF8.GetBytes(name, instanceNameBuffer);
  	var dnsBucket = (CRCHQX.CRCHqx(instanceNameBuffer, 0) % 100)
  	.ToString()
  	.PadLeft(2, '0');
  	spl = name.Split("/");
  	Hostname = $"{spl[1]}--{spl[0]}.c-{dnsBucket}.i.{dnsZone}";
  	SecretKey ??= secretKey;
  	}

[fantix]

Looks great in general! Just missing parsing the cloud-profile file in project stash dir.