Remove `@types/long` dependency

[ramikg]

I've removed the @types/long dependency, in order to avoid the following deprecation warning:

This is a stub types definition. long provides its own type definitions, so you do not need this installed.

[Graphmaxer]

Interested into this change since it break our builds

error TS2688: Cannot find type definition file for 'long'.
   The file is in the program because:
   Entry point for implicit type library 'long'

Currently, we fix it with overrides in the package.json

  "overrides": {
    "@types/long": "4.0.2"
  },

[Graphmaxer]

I created an issue in the Jira https://datastax-oss.atlassian.net/browse/NODEJS-671 Maybe it will help :/