[Tizen][M34-Merge] Implement Ewk_Settings: cache builder & default text encoding...

[Tizen][M34-Merge] Implement Ewk_Settings: cache builder & default text encoding name

This patch implement two Ewk_Settings: set cache builder enable
and set default text encoding name.
This is code migration from m34 beta to DEV,
Original patch info:
http://suprem.sec.samsung.net/gerrit/#/c/6533/3 and
http://165.213.202.130:8080/#/c/68824/

Bug: http://107.108.218.239/bugzilla/show_bug.cgi?id=7799
Reviewed by: Antonio Gomes, SeungSeop Park

Change-Id: I4c344a8ee508804939e9219f736ec5e4a901a703
Signed-off-by: zhishun.zhou <zhishun.zhou@samsung.com>