feat (realm-browser): Allow select multiples rows and delete all of them

[IvanCoronado]

@kraenhansen Main logic is done and currently, you can select multiples rows and delete them but I am still working on cleaning the code.

[kraenhansen]

This was added again - why?

[IvanCoronado]

@kraenhansen Allow using JS set with TS. The other option is updating the TS target to ES6 here https://github.com/realm/realm-studio/blob/master/tsconfig.json#L3 since we have an electron APP and we don't need to support any other browser.

https://github.com/realm/realm-studio/pull/593/files#diff-9782c73de5279cde9ace9669f0314891R503

[kraenhansen]

When I select multiple rows, I get some funky behaviour where every row has a cell highlighted from the last column I selected. For example - if I click the businessId 17 and shift click 50 I get this:

But if I then shift click "SUSHI ZONE" I get

I wouldn't expect the highlight to disappear from the businessId cells or the cells above "SUSHI ZONE" to be highlighted too.

[kraenhansen]

When altering a selection by removing single rows (cmd + click), the browser scrolls to the row that started the selection. This is really annoying when removing single items from the selection.

[bigfish24]

@kraenhansen can we get this merged?

_{Sent with GitHawk}

[kraenhansen]

@bigfish24 I'll take a look at it tomorrow - it needs some TLC as I tried to visualize above.