Pin on Flow Menu Context

[NghiaTranUIT]

Description

Since the Pin folder is implemented, we should add the Pin to the Flow Menu Context

Acceptance Criteria

• Small Issue: Add a Separator line below the Repeat
  

• Add Pin Menu Item (Put it below the Repeat Menu Item)
  How it looks like:

(other menu items)
--------------- (Seperator Line)
Repeat
---------------
Pin
---------------
Export (and other menu items)

• Pin the domain

1. If it exists -> Auto select the new Pinned Domain
2. If the domain doesn't exist -> Add new domain to the Pin Folder -> Auto select the new Pinned Domain

=> See the macOS version for the expected behavior