Support Ag Grid v33

[ndrezn]

We want to support Ag Grid v33.

To achieve this we need:

1. Close #372
2. Set up a v32 release branch to support v32 releases in parallel with v33
3. Upgrade the grid to support v33, which has backwards incompatible changes
4. Release an rc of v33
5. Update docs to use v33

It's not clear it will be possible to support our docs for both v32 and v33 as they can only have one Ag Grid version in the environment at a time.