Refactor SessionSchedule to use java.time classes

[Copilot]

• Refactored quickfixj-core/src/main/java/quickfix/DefaultSessionSchedule.java from Calendar/SimpleDateFormat internals to java.time (Instant, ZonedDateTime, DateTimeFormatter) and epoch-millis TimeInterval boundaries.
• Updated weekly/day-of-week session calculations in DefaultSessionSchedule to use WeekFields.SUNDAY_START, including previous-day/week rollover handling.
• Updated SessionSchedule API in quickfixj-core/src/main/java/quickfix/SessionSchedule.java to use isSameSession(long, long) plus a ZonedDateTime default bridge method.
• Updated quickfixj-core/src/main/java/quickfix/Session.java to call the long-based schedule API using session creation time millis.
• Updated quickfixj-core/src/main/java/quickfix/NoopStore.java creation-time handling to use SystemTime.currentTimeMillis()/Instant, and to derive calendar values on demand.
• Added/updated calendar/date-focused tests in quickfixj-core/src/test/java/quickfix/SessionScheduleTest.java, including testSessionStartInPreviousDayOfWeek() and ZonedDateTime-based isSameSession assertions.
• Added quickfixj-core/src/test/java/quickfix/DefaultSessionScheduleTest.java coverage for stable UTC toString() formatting.
• Included follow-up fix in quickfixj-core/src/test/java/quickfix/LogUtilTest.java so the store stub throws from getCreationTime() (matching the updated session path).
• Re-ran targeted tests for SessionScheduleTest and LogUtilTest after the changes.

[chrjohn]

@copilot LogUtilTest.testLogThrowable:51 fails

[Copilot]

@copilot LogUtilTest.testLogThrowable:51 fails

Fixed in 3ea3d92 by updating LogUtilTest to throw from getCreationTime(), which is the MessageStore method the current session path uses. I also re-ran LogUtilTest and SessionScheduleTest locally and both pass.

[chrjohn]

Hi @alexwibowo , any news regarding #1147 ? Could you take a look at this PR? I copied your failing test also to this branch and it seems to work... i need to do a final review though.