Fix integral decoding from property maps

[arpitagarwal1301]

Closes #1208

Summary

• validate Byte, Short, and Int values from Any-backed property maps before converting them
• accept only finite, integral, safe JavaScript numbers when decoding a Long
• preserve exact runtime-type behavior on JVM and Native and add focused common, JS, and JVM regression tests

Validation

• ./gradlew :kotlinx-serialization-properties:jvmTest :kotlinx-serialization-properties:jsNodeTest --tests '*Properties*NumericTest*'
• ./gradlew :kotlinx-serialization-properties:jvmTest :kotlinx-serialization-properties:jsNodeTest
• ./gradlew :kotlinx-serialization-properties:check (passed through JVM, JS, macOS ARM64 Native, ABI/artifact, and cross-target checks; stopped only because the local Xcode installation lacks the tvOS Simulator ARM64 SDK)
• git diff --check