…or access log request representations

AccessLogFormatter calls on AccesLogDataMap to format a number of strings, including request times; these are generally used in cookies and/or header values.
Previously, we used `strftime()` to format date/time values.
However, this is deprecated starting in PHP 8.1, with the recommendation of using `IntlDateFormatter` for purposes of formatting date/time strings in a locale-specific way.
Because I'm unclear on whether the formats will always come from internal classes, or if they might come from external sources (e.g., cookie values), I've created a new final class, `Mezzio\Swoole\StrftimeToICUFormatMap` for mapping strftime formats to the ICU equivalents.
I've added some basic tests for the class, which include demonstrating that the formats we use internally all get translated correctly.
I've also added a test case for `AccessLogDataMap::getRequestTime()` to demonstrate that it generates the same values.

Targeting the 3.5 series, as this is technically a bug in our PHP 8.1 support.

Signed-off-by: Matthew Weier O'Phinney <matthew@weierophinney.net>

Signed-off-by: Matthew Weier O'Phinney <matthew@weierophinney.net>

Since an ICU format can contain additional characters, we can wrap the returned format in the `[]` characters via concatenation instead.

Signed-off-by: Matthew Weier O'Phinney <matthew@weierophinney.net>

…in tests

Signed-off-by: Matthew Weier O'Phinney <matthew@weierophinney.net>

The StrftimeToICUFormatMap case for `%s` was calling `return time()`, which (a) was the incorrect type (a string should be returned), and (b) could lead to a mismatch between the request time and what is reported in the logs.

StrftimeToICUFormatMap::mapStrftimeToICU now accepts a second argument, a DateTimeInterface $requestTime, and this is used when `%s` is in the format.
AccessLogDataMap::getRequestTime creates a DateTimeImmutable instance from the server $request_time_float property and passes that value to StrftimeToICUFormatMap.

Creation of the callback for preg_replace_callback has been moved to another method, based on issues reported by Psalm; the callback now has full typehinting as well.

Signed-off-by: Matthew Weier O'Phinney <matthew@weierophinney.net>

Fix deprecation in request time formatting for access logs