SQlite caching layer appends a ".0" to BigDecimal fields that happen to be integers

[rmseng]

This changes equality comparisons in tests, but we have no evidence or reason to believe this poses any risk to nominal use. This can be exercised by changing mmtc-core/src/test/resources/TimeCorrelationConfigProperties.xml key telemetry.source.plugin.rawTlmTable.readDownlinkDataRate to true and running TelemetryCacheTest.simpleTest.

fysa @Lagejohn