Add Feature: Attribute Select

[mdroidian]

https://www.loom.com/share/b7648ed545ff42b4bff6aacc42461ee2

before this PR:

• [x] move selections to options tree for future proofing

probably also

• [x] refresh <Tab> on delete
• [x] refresh attribute observer on add/delete instead of keyboard shortcut

Would be nice

• [x] remove value from autocomplete after after add
• [x] controlled tabs
  • [x] focus on added attribute
  • [x] focus on block to add options

Future Additions

• multiple values
  • requires multiple adjustments
    • dialog
      • select box probably
    • what values are supported
      • [[``]]
      • #
      • plain text
      • block references?
      • commas?
• options
  • via UID
    • Status
  • via smartblock
    • <%CHILDREN:Status%>
    • <%QUERYBUILDER:someQuery,{text}%>
• choose default icon
• choose icon per attribute
• [x] inline dropdown instead of popup dialog
• [x] clicking the chevron-down should just display the blueprintjs Select without a button or "overlay"
• [x] after initial Add an Attribute is clicked, menu should be already open and displayed

[mdroidian]

tagging @dvargas92495 just for visibility

Here's a video with some of the changes since the first video

https://github.com/RoamJS/workbench/assets/3792666/6c6625f0-6925-4220-af86-b19d10f2b8ce