Convert the pmft module to nanobind

[joaander]

Description

Convert the pmft module to nanobind.

Motivation and Context

Part of the ongoing effort to move freud to nanobind.

How Has This Been Tested?

Execute existing unit tests.

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• I have updated the documentation (if relevant).
• I have added tests that cover my changes (if relevant).
• All new and existing tests passed.
• I have updated the credits.
• I have updated the Changelog.

[DomFijan]

I will give it a look by Monday 9th at the latest.

[joaander]

I will give it a look by Monday 9th at the latest.

OK, I'll have several more pull requests chained up by then.

[joaander]

The two follow up PRs are #1275 and #1278. We need all 3 merged before the hackathon.