feat: adding __repr__ method to CompactionMetrics

[avr2002]

Issue Link: #1373

[github-actions]

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[wjones127]

Thanks for making a PR! In order to make this ready to merge, could you make sure to add a unit test to validate the repr method works?

[wjones127]

I don't think function implementations are meant to be put into .pyi files, which are type stubs.

CompactionMetrics is implemented in Rust here:

lance/python/src/dataset/optimize.rs

Line 78 in 1b8adb5

pub struct PyCompactionMetrics {

Could you implement the method there in Rust? Here is an example Rust implementation of a __repr__ method:

lance/python/src/dataset/optimize.rs

Lines 113 to 119 in 1b8adb5

	pub fn __repr__(&self) -> PyResult<String> {
	Ok(format!(
	"CompactionPlan(read_version={}, tasks=<{} compaction tasks>)",
	self.0.read_version(),
	self.num_tasks()
	))
	}

[avr2002]

Thanks for getting back, I really appreciate the support. This is my first time contributing to open-source project. It'll try to implement this and get back.