perf: do not use pyo3-built

[orlp]

This crate only saved us ~50 LOC and included a hidden dependency on email.utils increasing our import times.

While in the process I also renamed the awkwardly named pl.build_info()["build"] to pl.build_info()["compiler"] and pl.build_info()["info-time"] is now a RFC2822 string pl.build_info()["time"].

[stinodego]

I guess this is technically a breaking change.. 🤔

[stinodego]

Let's call this variable compiler too, then?

Suggested change

	let build = PyDict::new_bound(py);
	let compiler = PyDict::new_bound(py);

[ritchie46]

I guess this is technically a breaking change.. 🤔

We have many more places where we don't regard anything about the exact output. E.g. explain, serialization, describe. This can join that list.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.33%. Comparing base (b61a5a9) to head (49e051e).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16309      +/-   ##
==========================================
+ Coverage   80.76%   81.33%   +0.57%     
==========================================
  Files        1393     1403      +10     
  Lines      179416   183333    +3917     
  Branches     2921     2924       +3     
==========================================
+ Hits       144910   149121    +4211     
+ Misses      34003    33709     -294     
  Partials      503      503              

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