[M85 Migration][API] Adds ewk_view_original_url_get

[M85 Migration][API] Adds ewk_view_original_url_get

There is no way to get original URL of current webview.
Android webview is supporting it. [1]
So this patch adds ewk_view_original_url_get which can get original URL
of given webview.

[1] https://developer.android.com/reference/android/webkit/WebView.html#getOriginalUrl()

References:
https://review.tizen.org/gerrit/c/platform/framework/web/chromium-efl/+/219988

Change-Id: I1d20b5549e28bd6fd4a2f5cb4321f037ecb5d620
Signed-off-by: yh106.jung <yh106.jung@samsung.com>