Remove legacy import circular reference

[dplewis]

New Issue Checklist

• [x] I am not disclosing a vulnerability.
• [x] I am not just asking a question.
• [x] I have searched through existing issues.
• [x] I can reproduce the issue with the latest versions of Parse Server and the Parse JS SDK.

Issue Description

Legacy import are in the form of const Parse = require('parse').Parse. This can be solved using export statement.

https://github.com/parse-community/Parse-SDK-JS/blob/cfb25ef322632c4136de3ab416f719f014f66027/src/Parse.ts#L417-L418

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