Add support for PHP8.2

[ignace nyamagana butera]

Feature Request

Q	A
New Feature	yes
BC Break	no

Proposal

PHP8.2 introduces DatePeriod::INCLUDE_END_DATE constant. Previously there was only DatePeriod::EXCLUDE_START_DATE . We should make it possible to setup the correct behaviour when period creates a DatePeriod

Currently Period v5 has the following enum InitialDatePresence with two state Included and Excluded.

We should either:

• Drop its support and rely Fully on boundaries;
• Add a new Enum that supports all possible iteration;
• Ugrade the current Enum with new values.