fix(bigint-serialization): - Fixed OpenAPI source BigInt scalar serialization to JSON

[kmaschi]

Description

OpenAPI sources generate BigInt scalars for Int64 format integers. Mesh fails to serialize this scalar to JSON. This change patches JSON parse to support BigInt.

Related Issue

CEXT-4620

Motivation and Context

How Has This Been Tested?

Linked CLI plugin

Screenshots (if appropriate):

Before

After

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.