Integrate mentions in the composer (#1799)

* Integrate mentions in the composer:

    - Add `MentionSpanProvider`.
    - Add custom colors needed for mentions.
    - Use the span provider to render mentions in the composer.
    - Allow selecting users from the mentions suggestions to insert a mention.

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Co-authored-by: ElementBot <benoitm+elementbot@element.io>

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/permalink/PermalinkParser.kt

@@ -133,13 +133,15 @@ object PermalinkParser {
         }
 
     private fun String.getViaParameters(): List<String> {
-        return UrlQuerySanitizer(this)
-            .parameterList
-            .filter {
-                it.mParameter == "via"
-            }
-            .map {
-                URLDecoder.decode(it.mValue, "UTF-8")
-            }
+        return runCatching {
+            UrlQuerySanitizer(this)
+                .parameterList
+                .filter {
+                    it.mParameter == "via"
+                }
+                .map {
+                    URLDecoder.decode(it.mValue, "UTF-8")
+                }
+        }.getOrDefault(emptyList())
     }
 }