[RPCPort][ACR] Support synchronous connection requests and private file sharing ...

[RPCPort][ACR] Support synchronous connection requests and private file sharing (#1898)

* [RPCPort] Support private sharing feature

If all added paths are under the caller application's data path which
can be obtained, those will be shared to the target application.
Platform will grant a temporary permission to the target application.

Signed-off-by: Hwankyu Jhun <h.jhun@samsung.com>
* [RPCPort] Support synchronous version connection request method

Signed-off-by: Hwankyu Jhun <h.jhun@samsung.com>
* [RPCPort] Move ShareFile() and UnshareFile() to Port.cs

Signed-off-by: Hwankyu Jhun <h.jhun@samsung.com>
* [RPCPort] Change parameter type to IEnumerable<string>

Signed-off-by: Hwankyu Jhun <h.jhun@samsung.com>
* [RPCPort] Remove unnecessary space

Signed-off-by: Hwankyu Jhun <h.jhun@samsung.com>