Revisit the default port forwarder for Lima v2.0

[AkihiroSuda]

lima/website/content/en/docs/config/port.md

Lines 12 to 22 in e827aa4

	The default port forwarder is shown in the following table.
	| Version | Default |
	| --------| ------- |
	| v0.1.0 | SSH |
	| v1.0.0 | GRPC |
	| v1.0.1 | SSH |
	| v1.1.0 | GRPC |
	The default was once changed to GRPC in Lima v1.0, but it was reverted to SSH in v1.0.1 due to stability reasons.
	The default was further reverted to GRPC in Lima v1.1, as the stability issues were resolved.

We have been going back and forth to switch the default port forwarder, but v2.0 seems another good opportunity to revisit the default port forwarder, as SSH seems to now outperform gRPC with:

• vz: add SSH over AF_VSOCK #3979

It is also reported that the gRPC port forwarder still has issues:

• GRPC port forwarding still has issues #3944

Maybe we should have the "dual" port forwarder that uses SSH for TCP and gRPC for UDP, as SSH still does not support UDP?

[norio-nomura]

I have a local branch that uses gvisor’s forwarder instead of gRPC forwarder.

I want a system that allows me to specify which mechanism to use as a forwarder for each rule.