Alan Plum @ArangoDB

As fetch is now universally supported across all targeted browsers (see [caniuse fetch](https://caniuse.com/?search=fetch)), we should be able to swap out the `xhr` library for native fetch. This would also help...

### Scope & Purpose *(Please describe the changes in this PR for reviewers, motivation, rationale - **mandatory**)* - [x] :hankey: Bugfix - [ ] :pizza: New feature - [ ]...

### Scope & Purpose This PR bumps the web UI to the latest preview of arangojs v9. - [ ] :hankey: Bugfix - [ ] :pizza: New feature - [...

[FE-423] Add a progress bar to reflect an index creation process

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### Scope & Purpose Indexes that are still in progress will now be shown in the index list.  This PR also updates the frontend to the latest preview release...

FE-446: primaryKeyCache and primarySortCache options missing for arangosearch Views and inverted indexes

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### Scope & Purpose This adds the primaryKeyCache and primarySortCache options as well as the storedValue cache option to arangosearch views and inverted indexes. These options are not available in...

### Scope & Purpose *(Please describe the changes in this PR for reviewers, motivation, rationale - **mandatory**)* - [x] :hankey: Bugfix - [ ] :pizza: New feature - [ ]...