Fix error pagination

[webant-ltd]

Q	A
Bug fix?	yes
New feature?	no
BC breaks?	no
Deprecations?	no
Tickets	n/a
License	MIT
Doc PR	n/a

I integrate a schemathesis tool for automatically testing api based on the openapi standard

When setting a large pag value, for example 9223372036854775807, a 500 error is caused

"Return value of ApiPlatform \ Core \ DataProvider \ Pagination :: getOffset () must be of the type integer, float returned"

Added a check for the type of the return value in the getOffset method on Pagination class,

if the value is outside the scope of int64 (https://www.php.net/manual/en/language.types.integer.php) throw an error "Large page and limit values"

[soyuka]

Please add a unit test

[webant-ltd]

@soyuka I add test

[alanpoulain]

A unit test too would be even better, but I think it's fine.

[soyuka]

Thanks @webant-ltd @vladimirDaron !