setup: require TLS 1.2 support from the Python interpreter (BC) Before it was optional, and either 1.1 or 1.2 was sufficient. Now that the default minimum is 1.2, it needs to be present to work out of the box. The code here is more convoluted than the corresponding checks in `sslutil.py`, but I'm leaving it alone because it can all be simplified when py38 is dropped.

run-tests: refactor the HGPORT handling code to use a constant for the max val Simple enough, and then we don't need comments to cross-reference other areas of code that need to be kept in sync. Since the `_getreplacements()` list is now partially dynamically generated and needed to change anyway, also move the one line that was being appended separately to the list for some reason, for clarity.

rust: fix darwin build

rust: remove `atty` dependency It is fully replaced with the now stable `std::io::IsTerminal` trait. This was the last dependency flagged as a warning by `cargo audit`, aside from `cpython` which we know about all too well: the plan is to transition to PyO3 soon-ish.

rust: update `env_logger` dependency Aside from being more up-to-date in general, this makes its own dependency on the unmaintained and now useless `atty` disappear.

rust: update `clap` to the latest 4.x version This brings in more up-to-date dependencies, some bug fixes (none of which are relevant yet), and slightly improved compile times.

rust: fix `cargo doc` warnings It makes sense to keep our doc build happy, even if it is lacking.

rust-compression: move the `Send` bound to the `Compressor` trait All compressors should be `Send`, might as well make any future use easier.

rust-inner-revlog: cache the compressor The `compress` function is unlikely to be used in highly contended situations, and creating a compressor has some overhead, on top of losing out on some potential advantages of longer-running optimizations from the compressor.

rust-lib: remove exports for not too common pattern-related types This only muddies the lib and makes the imports more confusing.

rust-lib: move `PatternError` to the `filepatterns` module This is where it belongs

rust-lib: move `Dirstate*Error` to the `dirstate` module That's where they belong and should always have been there.

rust-lib: only export very common types to the top of the crate This was done very early in the Rust project's lifecycle and I had very little Rust experience. Let's keep the `DirstateParents` since they'll pop up in all higher-level code and make the rest more explicit imports to make the imports less confusing and the lib less cluttered.

rust-dirstate: remove star exports This makes the crate's imports confusing and muddies the discovery of the code.

rust-dirstate: merge `dirstate_tree` module into `dirstate` The historical reasonning for `dirstate_tree` existing in the first place is that a new approach was needed for the tree-like dirstate and it was easier to start somewhat fresh. Now that the former dirstate is (long) gone, we can merge those two modules to avoid the confusion that even the module creators sometimes get.