Add server description to the benchmark report

[GromNaN]

• Add custom environment description with MongoDB URI, topology and version
• Remove BaseBench so I don't call its static method from outside, use dedicated classes.
• Get Warmup change from PHPLIB-1235 Implements Single-Doc Benchmarks #1161 (comment) (I'll open an issue on phpbench)

This is to highlight that server topology have a huge impact on performance. #1161 (comment)

Example

[alcaeus]

Found a tiny typo, LGTM otherwise. Good find about the environment provider, I think that's good information to print about the runs 👍

[jmikola]

Is there any need to parameterize the collection name? I assume not now, and if this comes up down the line we can always switch over to a param with a default value.

[GromNaN]

Seen you comment after merging. We will figure out if we need more than one collection.
Same for client options that were not used and that I removed in the PR.