Dhruv Manilawala 3ee670440c Assert the parser is at augmented assign token (#10269) ...

## Summary

This PR updates fixes one of the `FIXME` comment to assert that the
parser is at one of the possible augmented assignment token when parsing
an augmented assignment statement.

## Test Plan

1. Add valid test cases for all the possible augmented assignment tokens
2. Add invalid test cases similar to assignment statement

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..

expressions

Replace LALRPOP parser with hand-written parser

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statement

Assert the parser is at augmented assign token (#10269)

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