Rebase 1.x to 1.4.5

[javier-godoy]

Feature proposal

Now that we have version 2.x on master for Vaadin 24-25, we should rebase 1.x to https://github.com/FlowingCode/GridHelpers/tree/grid-helpers-1.4.5 (since later changes are all "for compatibility with Vaadin 25" and don't have place into such branch)

Describe solution expectations

No response

Additional information

No response

[javier-godoy]

Back to triage per https://github.com/FlowingCode/AddonsInternal/issues/146

[javier-godoy]

Branch reset to e75647d