feat: Make the DataProxyProvider work in Flagship app

In previous implementation we disabled the DataProxy in Flagship app
because this feature was not implemented yet in that environment

We are working on implementing it in the Flagship app, so we want the
DataProxyProvider to be able to use the Flagship's implementation

This commit implements this by checking the feature availability on the
Flagship app and then by redirecting the DataProxy calls through the
webviewIntent

packages/cozy-dataproxy-lib/src/dataproxy/DataProxyProvider.jsx

@@ -4,6 +4,7 @@ import React, { useContext, useState, useEffect } from 'react'
 import { useClient } from 'cozy-client'
 import { isFlagshipApp } from 'cozy-device-helper'
 import flag from 'cozy-flags'
+import { useWebviewIntent } from 'cozy-intent'
 import Minilog from 'cozy-minilog'
 
 const log = Minilog('👷‍♂️ [DataProxyProvider]')
@@ -18,6 +19,7 @@ export const useDataProxy = () => {
 
 export const DataProxyProvider = React.memo(({ children, options = {} }) => {
   const client = useClient()
+  const webviewIntent = useWebviewIntent()
   const [iframeUrl, setIframeUrl] = useState()
   const [dataProxy, setDataProxy] = useState()
   const [dataProxyServicesAvailable, setDataProxyServicesAvailable] =
@@ -61,18 +63,59 @@ export const DataProxyProvider = React.memo(({ children, options = {} }) => {
       } catch (error) {
         setDataProxyServicesAvailable(false)
         log.error(
-          'Error whild initializing Search intent, dataproxy features will be disabled',
+          'Error while initializing Search intent, dataproxy features will be disabled',
+          error
+        )
+      }
+    }
+
+    const initFlagship = async () => {
+      try {
+        if (!webviewIntent) {
+          return
+        }
+
+        if (!flag('cozy.search.enabled')) {
+          log.log(
+            'Dataproxy features will be disabled due to missing feature flags'
+          )
+          setDataProxyServicesAvailable(false)
+          return
+        }
+
+        log.log('Initializing DataProxy intent in Flagship app')
+        const isSearchAvailable =
+          (await webviewIntent?.call('isAvailable', 'search')) ?? false
+
+        if (!isSearchAvailable) {
+          log.log(
+            'Dataproxy features will be disabled due to feature not supported by Flagship app'
+          )
+          setDataProxyServicesAvailable(false)
+          return
+        }
+
+        setDataProxy(() => ({
+          search: (search, options) =>
+            webviewIntent?.call('search', search, options)
+        }))
+
+        setDataProxyServicesAvailable(isSearchAvailable)
+      } catch (error) {
+        setDataProxyServicesAvailable(false)
+        log.error(
+          `Error while initializing Flagship's Search, dataproxy features will be disabled`,
           error
         )
       }
     }
 
     if (isFlagshipApp()) {
-      setDataProxyServicesAvailable(false)
+      initFlagship()
     } else {
       initIframe()
     }
-  }, [client])
+  }, [client, webviewIntent])
 
   const onIframeLoaded = () => {
     const ifr = document.getElementById('DataProxy')