## Description
> [!TIP]
**Goal**
To drag any building blocks from the explorer and drop at any position
on the users canvas with full implementation.
**Implementation**
- Show skeleton widget when building block is initially dragged unto the
canvas.
- Make API call to add datasources, queries, and JS to existing page of
users app
- Get returned widget DSL and use existing copy paste logic to display
widgets on the canvas
- Remove loading state, handle clean up for copy paste
- Run all queries newly created by the dropped building block
**Limitations**
- There is a loading state and the process is not instant like dropping
a widget
This PR is followed by this one
[here](https://github.com/appsmithorg/appsmith/pull/31406), which
displays the loading state when a building block is dragged unto the
canvas.
Fixes#31856
## Automation
/ok-to-test tags="@tag.Templates, @tag.MainContainer, @tag.Visual,
@tag.Widget"
### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results -->
> [!TIP]
> 🟢🟢🟢 All cypress tests have passed! 🎉🎉🎉
> Workflow run:
<https://github.com/appsmithorg/appsmith/actions/runs/8701664455>
> Commit: 456a7a0a322e76974a7f5c41a6c1e274ef82e4ea
> Cypress dashboard url: <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=8701664455&attempt=1"
target="_blank">Click here!</a>
<!-- end of auto-generated comment: Cypress test results -->
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Introduced a new "Building Blocks" category in the widget sidebar for
enhanced organization and accessibility.
- Added functionality to resize building blocks with new horizontal and
vertical limits.
- Implemented a "see more" button for "Building Blocks" to display all
associated widgets.
- Enhanced drag and drop functionality for building blocks on the
canvas.
- **Enhancements**
- Improved sorting logic for widgets, prioritizing "Building Blocks".
- Enhanced widget search functionality within the sidebar.
- **Bug Fixes**
- Adjusted default rows and columns settings for explorer building
blocks to improve layout and usability.
- **Documentation**
- Updated messages and constants related to new features for clarity and
consistency.
- **Refactor**
- Refactored drag and drop handling logic to support new building block
constraints and features.
- Updated application state management to include building blocks
related data.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
---------
Co-authored-by: Anagh Hegde <anagh@appsmith.com>
Co-authored-by: Rahul Barwal <rahul.barwal@appsmith.com>
0118051301