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Extension trait for controlled trimming of prefixes and suffixes of `&str` and `String`.

Provided methods trim only if the given pattern matches exact number of times, otherwise they return
the unmodified `&str`. This can be used for primitive parsing and text analysis.

```rust
assert_eq!(Ok("trimmed"), "not trimmed".trim_left_matches_exactly("not ", 1));
assert_eq!(Err("not trimmed"), "not trimmed".trim_left_matches_exactly("very ", 1));
assert_eq!(Ok("trimmed"), "tttrimmed".trim_left_matches_exactly('t', 2));
```