Add support for inferring a selector for multiple elements

[twschiller]

Context

• When using certain bricks, a user wants to be able select multiple elements on the page. For example, the For Each Element brick is used to loop over elements on the page
• PixieBrix supports selectos that return multiple elements, but does not have a way to automatically infer the selector
• TODO: need to determine the UX for how the user refines the multiple selection

Implementation Sketch

• TBD: product specification page on Notion: https://www.notion.so/pixiebrix/Multi-element-Selector-Inference-15c6836a77d948f686398eef9e1b2e6e

Out of Scope

• Our "JQuery reader" brick supports reading an array of values, but we don't expose the "multi" in the Page Editor interface yet: https://github.com/pixiebrix/pixiebrix-extension/blob/2b008150d653519b9c536d7a6765137ca6669291/src/blocks/readers/jquery.ts#L29-L29

Related Code

• SelectorSelectorWidget: https://github.com/pixiebrix/pixiebrix-extension/blob/2b008150d653519b9c536d7a6765137ca6669291/src/pageEditor/fields/SelectorSelectorWidget.tsx#L169-L169
• For Each Element brick definition: https://github.com/pixiebrix/pixiebrix-extension/blob/2b008150d653519b9c536d7a6765137ca6669291/src/blocks/transformers/controlFlow/ForEachElement.ts#L26-L26

[twschiller]

@jcforest I will be working on the UX specification for this with @corinnemayans next week

[twschiller]

@jcforest we can continue to use this issue for the inference/generalized selector work you're now using

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