Shorten some names

[lars-reimann]

• Replace maximum with max (already done in some places)
• Replace minimum with min (already done in some places)
• Document "allowed" abbreviations in guidelines
• Replace number_of with _count (already done for e.g. missing_value_count)

For example, minimum_number_of_samples_in_leaves could become min_sample_count_in_leaves. Saves some line width at basically no loss of readability.

[lars-reimann]

🎉 This issue has been resolved in version 0.26.0 🎉

The release is available on:

• v0.26.0
• GitHub release

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