eigenlayer operator keys create to use directory relative to $HOME

[shrimalmadhur]

Is your feature request related to a problem? Please describe.
Currently eigenlayer operator keys create creates keys in the folder relative to the current working directory. The list command will fail if we use list command in some other directory

Describe the solution you'd like

• Use a folder relative to home directory (maybe which the install command is using)

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.