* refactor(console): migrate code editor to React + overhaul query result experience

Bug fixing:

- Scroll bar on Schema view
- Animation leaving stale tables for the Schema view
- Fix error handling on failing requests (and cancelled)

Improvements:

- Use toast notifications to give feedback to the user on query responses
- Improve wording of error messages + handle more scenarios
- Create the foundation of @questdb/client + support DDL, DQL and ERROR types
- Add splitter between Schema and Editor
- Move loader bar to the top of the page
- Improve transitions
- Uniform the use of z-index
- Add ellipsis mode to Text component
- Improve support of QuestDB SQL in Ace

Chores:

- Remove dead code
- Upgrade deps

* feat(Splitter): add max boundary

> This is a preview of the new Saved Queries component.
> 
> In order to test it, edit the file in:
> 
> ```
> <root_dir>/public/assets/console-configuration.json
> ```
> 
> Like the following:
> 
> ```json
> {
>   "readOnly": false,
>   "savedQueries": [
>     {
>       "name": "Select data",
>       "value": "SELECT * FROM trips;"
>     },
>     {
>       "name": "Aggregations",
>       "value": "SELECT count() FROM trips;"
>     },
>     {
>       "name": "Keyed aggregations",
>       "value":  "SELECT hour(trip_datetime), count() FROM trips;"
>     },
>     {
>       "name": "Keyed aggregations by time with SAMPLE BY",
>       "value":  "SELECT hour(trip_datetime), count() FROM trips SAMPLE BY 1M;"
>     },
>     {
>       "name": "Assemble tables based on time with ASOF JOIN",
>       "value":  "trips ASOF JOIN weather;"
>     }
>   ]
> }
> ```

fixed #207 

Bower is deprecated and it is recommended to migrate to newer alternatives.

Gulp works well for small and straightforward projects but it becomes quickly
hard to maintain on a larger codebase. Also, Webpack modern features such as
tree shaking are very useful and allow us to save 1MB on CSS for example.

Overall, this makes the maintenance of the Console much easier. Everything is in
one place (`package.json`) with maximum flexibility:

- The current code just stays the way it is but already benefit from the new
framework (`import`, optional typescript/es7, etc.) - Any new code can be
written in TypeScript (with Babel) following latest standards with extensive
linting rules.

The README.md was updated too, I believe that the transition should be smooth +
the development experience was improved as a result of using webpack-dev-server.

change of licensing. All core code (java and C) is now distributed under AGPLv3. UI components and source code under MIT and examples still under Apapche 2.0