[Bug] keys that start with double underscores (__)

[baudointran]

Your Environment

Software	Version(s)
typeorm-fixtures	3.1.0
Node	20.11.0
npm/Yarn	10.2.4
Operating System	ubuntu

I'm encountering an issue when using typeorm-fixtures-cli to insert data that contains keys or columns starting with double underscores (__). Specifically, the insertion fails, and I suspect it might be related to how TypeORM or the underlying database handles these keys.

Steps to Reproduce:
Create a fixture with a key that starts with __. For example:
yaml
Copier le code
EntityName:
entity_1:
__myKey: "SomeValue"
anotherField: "AnotherValue"
Run typeorm-fixtures-cli to load the fixture into the database.
Observe that the insertion fails with an error.

Expected Behavior:
The data should be inserted without issues, regardless of whether the keys or columns start with double underscores.