AdView: support multi imps request, related to prebid-server adapter PR

#3355 (#5126)

* AdView: support multi imps request

* fixed markdown format error.

* support safeframes.

* sidebarType added.

* change gpp_support to gpp_sids.

---------

Co-authored-by: wildcat0601 <wildcat0601@qq.com>

dev-docs/bidders/adview.md

@@ -7,23 +7,24 @@ tcfeu_supported: true
 gvl_id: 1022
 usp_supported: true
 coppa_supported: true
+gpp_sids: tcfeu, usca
 schain_supported: true
 dchain_supported: false
-userId: 
 media_types: banner, video, native
-safeframes_ok: true
+floors_supported: true
 bidder_supports_deals: true
 pbjs: false
 pbs: true
 pbs_app_supported: true
 prebid_member: false
+safeframes_ok: true
+multiformat_supported: will-bid-on-any
+ortb_blocking_supported: true
 sidebarType: 1
 ---
 
 ### Note
 
-Currently adapter doesn’t support multi impression and can not perform impression splitting, so only the first impression will be delivered.
-
 The Example Bidding adapter requires setup before beginning. Please contact us at <partner@adview.com>
 
 ### Bid Params