Full node streaming -- perp position to signed int (backport #2544)

[mergify[bot]]

previously was uint32. change to int64

Summary by CodeRabbit

• New Features

  • Updated handling of the quantums field in subaccount positions to allow for negative values, indicating short positions.
  • Enhanced documentation for clarity on the quantums field's interpretation.

• Bug Fixes

  • Adjusted data type of quantums from uint64 to int64 across relevant interfaces and methods to reflect the ability to represent negative values.

---

This is an automatic backport of pull request #2544 done by Mergify.

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