Quote and unquote number keys (#8508)
* Quote and unquote number keys
* Add changelog entry
* Add tests for escapes
* Fix idempotency
* Only run flow-repo/ tests with flow
271 jsfmt.spec.js in flow-repo use only the flow parser.
18 use flow and babel.
Now, all of them use only flow.
* Don’t unquote negative numbers
* Don’t quote/unquote numbers in TypeScript
* Quote BigInt
* Fix AST check
* Fix condition
* Fix BigInt to string
* Fix ESLint not recognizing BigInt
* Only quote/unquote “simple” numbers
* No need to clean BigIntLiteral anymore
* Add tests for 1. and .1
* Fix 1. and .1
* Remove unnecessary babel-ts from tests
* Only unquote numbers for babel
* Update changelog
