odo dev - should store information about currently forwarded ports.

[kadel]

User Story

• As an odo developer
• I want to be able to get information about what ports are currently forwarded
• So that I can display that information to user

Currently, the only way to get information about currently forwarded ports is from odo dev output.
This can be problematic, as there are situation where we want to display this information to users like in odo describe component output (#5661)

Acceptance Criteria

• odo dev should store information about currently forwarded ports in .odo/devstate.json. If the file doesn't exist it should create it.
• see example for how the devstate.json structure should look like
• as part of the "shutdown" procedure odo dev should remove forwardedPorts field from .odo/devstate.json
• documentation

example

$ cat .odo/devstate.json

{
    "forwardedPorts": [
        {
        "containerName": "runtime",
        "containerPort": 8080,
        "localPort": 40001,
        "localAddress": "127.0.0.1"
        }
    ]

}

/kind user-story