NetworkPkg/HttpBootDxe: Add Support for HTTP Boot Basic Authentication

NetworkPkg/HttpBootDxe: Add Support for HTTP Boot Basic Authentication

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=2504

Add support for TLS Client Authentication using Basic Authentication
for HTTP Boot

Cc: Maciej Rabeda <maciej.rabeda@linux.intel.com>
Cc: Wu Jiaxin <jiaxin.wu@intel.com>
Cc: Siyuan Fu <siyuan.fu@intel.com>
Signed-off-by: Saloni Kasbekar <saloni.kasbekar@intel.com>
Reviewed-by: Maciej Rabeda <maciej.rabeda@linux.intel.com>