Konga: Kong 1.3 support

[jeremyjpj0916]

Cross referencing my gitter ping @pantsel :

Planning any Kong 1.3 changes support? Could you throw in the services new "client_certificate" field as an option?

And if the lb policies for upstream resources is hard coded including the new leas connections option would be dope.

Edit: and support for the CA Certs resource new:
https://docs.konghq.com/1.3.x/admin-api/#ca-certificate-object

[sjw2003go]

Also kong v1.3 support route by header, but konga not support.

[ehcostream]

kong v1.3 support grpc, but konga not support

[daozhu]

kong v1.3 support the ARM64 architectures, but konga not support