Provide kubeconfig/context defaulting in context create workflow

[vuil]

Describe the feature request

The context create workflow involving supplying a kubeconfig context can leverage conventions on location of the default kubeconfig file and the active context in the kubeconfig, to minimize the amount of user input is the common cases.
e.g.

Prepopulate default standard kube config location
? Select context creation type Local kubeconfig
? Enter path to kubeconfig (~/.kube/config) /Users/dfein/.kube/config


Kube context selector 
? Select context creation type Local kubeconfig
? Enter path to kubeconfig (~/.kube/config) /Users/dfein/.kube/config
? Enter kube context to use
  > default
    name one
    second name
   

this would help with long kube context names

option to create tanzu context from currently active kube config/context 
? Select context creation type Local kubeconfig
? Enter path to kubeconfig (~/.kube/config) /Users/dfein/.kube/config <enter>
? Select context creation type Local kubeconfig <enter>

would save having to specify kube config / context 

Describe alternative(s) you've considered

Affected product area (please put an X in all that apply)

• ( ) APIs
• ( ) Addons
• (X) CLI
• ( ) Docs
• ( ) IAM
• ( ) Installation
• ( ) Plugin
• ( ) Security
• ( ) Test and Release
• (X) User Experience
• ( ) Developer Experience

Additional context