Include a file-safe room name and ISO date in chat exports (#9440)

* conversation export named after room

* sanitization added for exported file name

* sanitization added for exported file name

* sanitization added for exported file name

* sanitization added for exported file name=>lint error fixed

* sanitization added for exported file name=>lint error fixed

* sanitization added for exported file name=>redundancy removed

* sanitization added for exported file name=>redundancy removed

* reverted to previous commit

* sanitization added for exported file name=>redundancy removed

* exported chat date iso formatted

* conversation export named after room

* conversation export named after room

Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>

* code refacto filename date format

* Add docs to fn

* Bring in a util library for sanitizing

* Extract file naming function and make consistent for all 3 types

Also use the library we dragged in

* Write tests & associated fixes

* Apply linters locally

* Include new date util in index

Co-authored-by: Sinharitik589 <sinharitik18112835@gmail.com>
Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>
Co-authored-by: yaya-usman <yayaazeez222@gmail.com>
Co-authored-by: Sinharitik589 <67551927+Sinharitik589@users.noreply.github.com>

test/test-utils/date.ts

@@ -0,0 +1,17 @@
+/*
+Copyright 2022 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+export const REPEATABLE_DATE = new Date(2022, 10, 17, 16, 58, 32, 517);