[Feature Request]: Allow widget values to be forwarded to other nodes

### Is there an existing issue for this?

- [x] I have searched the existing issues and checked the recent builds/commits

### What would your feature do ?

This feature will allow the user to take the value of a manually input widget (of a node), and forward it to other nodes. Thus, no useful information is lost on a node, and can be forwarded if needed.

### Proposed workflow

See the concept image below, in which the value of the 'width' widget of the 'Empty Latent Image' node is being forwarded to the 'a' input of the 'Math Expression' node.


I don't know all the output types, but even if they are capped to only the basic types, i.e. INT, FLOAT and STRING, it would still be a great.


### Additional information

This feature will not only help in decreasing nodes, and saving metadata info, but it will also minimize the vertical length of nodes where output values are already put in widgets, like 'Get Image Size' and 'Rescale/Resize Image' type nodes.

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-2825-Feature-Request-Allow-widget-values-to-be-forwarded-to-other-nodes-1ab6d73d36508182bbd3cb586f6a9480) by [Unito](https://www.unito.io)