… client (#42)

Resolves: #41

this clarifies what `--all-namespaces` does and adds
this to the `README.md`

This introduces a number of changes to enable the `WhoCan` type to be
used in external projects. The `WhoCan` type is exported, and functions
are introduced to allow instances of `WhoCan` and `Action` to be
created. It also modifies the `Check` function to no longer call
`output` to display the results. Instead, `Check` returns the role
bindings that enable an action to be performed. The call to `output` now
takes place in the run function for the command.

Overall, this results in no functional changes to the `kubectl-who-can`
program, but allows it to be imported and used from other projects.

Signed-off-by: Bridget McErlean <bmcerlean@vmware.com>
Co-authored-by: Daniel Pacak <pacak.daniel@gmail.com>

Signed-off-by: Daniel Pacak <pacak.daniel@gmail.com>

Signed-off-by: Daniel Pacak <pacak.daniel@gmail.com>

Signed-off-by: Daniel Pacak <pacak.daniel@gmail.com>
Co-authored-by: Teppei Fukuda <knqyf263@gmail.com>

This changes all the fields of Action to be exported so that an Action
object can be created from an external package.

Signed-off-by: Bridget McErlean <bmcerlean@vmware.com>
Co-authored-by: Daniel Pacak <pacak.daniel@gmail.com>

This updates the `NewWhoCan` method to take a `rest.Config` object
instead of a `ClientConfig` object. This allows the consumer of the API
to use a custom `rest.Config` object rather than relying on the one
created from the `ClientConfig` object.

This also removes the `clientConfig` field from the `WhoCan` object. It
is only used within the `ActionFrom` method, and it is passed in as an
argument. As a result, there is no need to store it on the `WhoCan`
object.

Signed-off-by: Bridget McErlean <bmcerlean@vmware.com>

Resolves: #63

Signed-off-by: Daniel Pacak <pacak.daniel@gmail.com>

Resolves: #70

Signed-off-by: Daniel Pacak <pacak.daniel@gmail.com>

Signed-off-by: Daniel Pacak <pacak.daniel@gmail.com>

Signed-off-by: Daniel Pacak <pacak.daniel@gmail.com>

Signed-off-by: Daniel Pacak <pacak.daniel@gmail.com>

Resolves: #57

Co-authored-by: Carol <krol3@users.noreply.github.com>

Co-authored-by: Liz Rice <liz@lizrice.com>
Signed-off-by: Daniel Pacak <pacak.daniel@gmail.com>