fix(runtime): Extract error code for all OS error variants

[kamilogorek]

Changes in #17719 made all read_file methods return ErrorData::Custom instead of the original ErrorData::Os.
This is correct and unified behavior, however problematic at the same time, as get_io_error_code is not implemented for all possible ErrorKind variants.

In order to work around this, the newly created error is wrapped in anyhow::Error and the original std::io::Error is provided as its context. This makes a downcasting in get_error_code successful and allows get_os_error_code to be used for code extraction instead of problematic get_io_error_code.

File in question: https://github.com/denoland/deno/blob/main/core/error_codes.rs

It also changes error format from (err, desc to err: desc).

Error: Is a directory (os error 21), readfile 'test'
Error: Is a directory (os error 21): readfile 'test'


NotFound: No such file or directory (os error 2), readfile 'tes'
NotFound: No such file or directory (os error 2): readfile 'tes'

Note that on Windows, EISDIR is reported as ENOENT due to Deno using libuv mappings (Windows code for this is 267) - https://github.com/libuv/libuv/blob/master/src/win/error.c

Fixes #17950

[aapoalas]

LGTM, but needs rebase.

[kamilogorek]

Done. All green!

[aapoalas]

Thank you once again, and nice work!

[bartlomieju]

@aapoalas please land at first convenience