Play Framework

refactor: remove Joda Time in favor of java.time (PF-27, release 1.12.27)

Hard-removes joda-time 2.14.0 from the framework. The DateTimeBinder
wrapper, the dep entry, the lib jar, and the COPYING attribution are all
gone. The 2014-tzdata-era JodaTimeTest is also dropped (not Play's
responsibility).

Adds 7 new java.time type binders mirroring the existing LocalDateTime*
pattern verbatim (null/blank short-circuit, default ISO-8601 parse(),
DateTimeParseException on malformed input):
  - Instant, ZonedDateTime, OffsetDateTime, OffsetTime
  - Year, YearMonth, Duration

Each new binder gets a *BinderTest with 5 cases (null/empty/whitespace/
valid/invalid). Registrations land alongside existing LocalDate*Binder
entries in Binder.java's static initializer.

A "Migrating from Joda Time" section in README.md documents the type
mapping (DateTime UTC -> Instant, DateTime+zone -> ZonedDateTime,
DateTime+offset -> OffsetDateTime, etc.), the ZonedDateTime offset-only
caveat (yields fixed-offset zone, not DST-aware), and the
validation.invalid surfacing semantics for malformed input.

Apps that still need Joda for non-binding code paths must add it to
their own dependencies.yml.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>