InputCommon/ExpressionParser: Add compound assignment operators. #13327
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It does what you'd expect.
![image](https://private-user-images.githubusercontent.com/1768214/408897998-15b775a0-1518-4785-afea-16de56f3daef.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.fYejjen6aOM_6CGBIC6IURKeOCqX47BXs-qNjFbmcN4)
Same precedence as assignment operator with right-to-left associativity
![image](https://private-user-images.githubusercontent.com/1768214/408898651-04bfd30a-e7e5-48f5-abf8-607112ef25cb.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3MzkyOTA4NjEsIm5iZiI6MTczOTI5MDU2MSwicGF0aCI6Ii8xNzY4MjE0LzQwODg5ODY1MS0wNGJmZDMwYS1lN2U1LTQ4ZjUtYWJmOC02MDcxMTJlZjI1Y2IucG5nP1gtQW16LUFsZ29yaXRobT1BV1M0LUhNQUMtU0hBMjU2JlgtQW16LUNyZWRlbnRpYWw9QUtJQVZDT0RZTFNBNTNQUUs0WkElMkYyMDI1MDIxMSUyRnVzLWVhc3QtMSUyRnMzJTJGYXdzNF9yZXF1ZXN0JlgtQW16LURhdGU9MjAyNTAyMTFUMTYxNjAxWiZYLUFtei1FeHBpcmVzPTMwMCZYLUFtei1TaWduYXR1cmU9NTJkNzM5ZWJjMDE1OTY2YzZiZjIzMzQyYjc3MWUyZWUyNGU2N2JjMzhkZWY4ZTgwMDkwYTdmMmFhZjllMGZmZiZYLUFtei1TaWduZWRIZWFkZXJzPWhvc3QifQ.XtPfmh1FO2jl5w4sCByf_yb2IggPOYwbI--ELeE6Xkw)