Add CertData, KeyData and CAData to genericclioptions.configflags

[barryib]

Add CertData, KeyData and CAData to let developper provider certificate and key as [byte] and not only throught file. These already exist in rest.config and other kubernetes interfaces.

Something like this:

type ConfigFlags struct {
	CacheDir   *string
	KubeConfig *string

	// config flags
	ClusterName      *string
	AuthInfoName     *string
	Context          *string
	Namespace        *string
	APIServer        *string
	Insecure         *bool
	CertFile         *string
	KeyFile          *string
	CAFile           *string
	BearerToken      *string
	Impersonate      *string
	ImpersonateGroup *[]string
	Username         *string
	Password         *string
	Timeout          *string

	// CertData holds PEM-encoded bytes (typically read from a client certificate file).
	// CertData takes precedence over CertFile
	CertData []byte
	// KeyData holds PEM-encoded bytes (typically read from a client certificate key file).
	// KeyData takes precedence over KeyFile
	KeyData []byte
	// CAData holds PEM-encoded bytes (typically read from a root certificates bundle).
	// CAData takes precedence over CAFile
	CAData []byte
        // ...
}

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