Matter framework safe conversion for known enum (#36015)

* [Matter.framework] MTRConversion.h: error: arithmetic between enumeration type 'chip::(unnamed enum at src/lib/support/TimeUtils.h:99:1)' and floating-point type 'NSTimeInterval' (aka 'double') [-Werror,-Wenum-float-conversion]

* [Matter.framework] MTRConversion.mm: error: arithmetic between floating-point type 'NSTimeInterval' (aka 'double') and enumeration type 'chip::(unnamed enum at src/lib/support/TimeUtils.h:32:1)' [-Werror,-Wenum-float-conversion]

* [Matter.framework] MTRBaseDevice.mm: error: arithmetic between floating-point type 'NSTimeInterval' (aka 'double') and enumeration type 'chip::(unnamed enum at lib/support/TimeUtils.h:32:1)' [-Werror,-Wenum-float-conversion

src/darwin/Framework/CHIP/MTRBaseDevice.mm

@@ -1894,7 +1894,7 @@ NSTimeInterval MTRTimeIntervalForEventTimestampValue(uint64_t timeValue)
     uint64_t eventTimestampValueSeconds = timeValue / chip::kMillisecondsPerSecond;
     uint64_t eventTimestampValueRemainderMilliseconds = timeValue % chip::kMillisecondsPerSecond;
     NSTimeInterval eventTimestampValueRemainder
-        = NSTimeInterval(eventTimestampValueRemainderMilliseconds) / chip::kMillisecondsPerSecond;
+        = NSTimeInterval(eventTimestampValueRemainderMilliseconds / static_cast<uint64_t>(chip::kMillisecondsPerSecond));
     NSTimeInterval eventTimestampValue = eventTimestampValueSeconds + eventTimestampValueRemainder;
 
     return eventTimestampValue;

src/darwin/Framework/CHIP/MTRConversion.h

@@ -38,7 +38,8 @@ AsNumber(chip::Optional<T> optional)
 
 inline NSDate * MatterEpochSecondsAsDate(uint32_t matterEpochSeconds)
 {
-    return [NSDate dateWithTimeIntervalSince1970:(chip::kChipEpochSecondsSinceUnixEpoch + (NSTimeInterval) matterEpochSeconds)];
+    const uint64_t interval = static_cast<uint32_t>(chip::kChipEpochSecondsSinceUnixEpoch) + matterEpochSeconds;
+    return [NSDate dateWithTimeIntervalSince1970:(NSTimeInterval) interval];
 }
 
 template <typename Rep, typename Period>

src/darwin/Framework/CHIP/MTRConversion.mm

@@ -92,7 +92,7 @@ bool DateToMatterEpochMilliseconds(NSDate * date, uint64_t & matterEpochMillisec
 
 bool DateToMatterEpochMicroseconds(NSDate * date, uint64_t & matterEpochMicroseconds)
 {
-    uint64_t timeSinceUnixEpoch = static_cast<uint64_t>(date.timeIntervalSince1970 * chip::kMicrosecondsPerSecond);
+    uint64_t timeSinceUnixEpoch = static_cast<uint64_t>(date.timeIntervalSince1970 * static_cast<double>(chip::kMicrosecondsPerSecond));
     if (timeSinceUnixEpoch < chip::kChipEpochUsSinceUnixEpoch) {
         // This is a pre-Matter-epoch time, and cannot be represented as an epoch time value.
         return false;