Use stdlib toHexString

[twyatt]

Note

ManufacturerData and ServiceData toString outputs will now have lowercase hex (previously was uppercase).
This is more aligned with the default toHexString format provided by the stdlib, but should be called out in the release notes when this ships.

Note

Low Risk
Display/logging-only refactor with no BLE filtering or I/O behavior changes; minor toString() formatting differences possible where default hex casing differs from the old helper.

Overview
Replaces the internal Tuulbox-style ByteArray.toHexString helper with Kotlin stdlib toHexString / HexFormat.

Logging hex output (logs/Hex.kt) now builds a HexFormat from existing HexBuilder options (byte separator and upper vs lower case) and passes it to data.toHexString(format).

Filter debug strings for ManufacturerData use HexFormat.UpperCase for data so those fields stay uppercase in toString(); dataMask uses the default format.

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[twyatt]

Ran HexTests against main @ 0a7f5f9:

Results

..

HexTests > customSeparator_singleByte_hasNoSeparator STARTED

HexTests > customSeparator_singleByte_hasNoSeparator PASSED

HexTests > customSeparator_multipleBytes_usesConfiguredSeparator STARTED

HexTests > customSeparator_multipleBytes_usesConfiguredSeparator PASSED

HexTests > defaultHex_multipleBytes_defaultsToSpaceSeparatorAndUpperCase STARTED

HexTests > defaultHex_multipleBytes_defaultsToSpaceSeparatorAndUpperCase PASSED

HexTests > defaultHex_singleByte_returnsUpperCaseHex STARTED

HexTests > defaultHex_singleByte_returnsUpperCaseHex PASSED

HexTests > lowerCase_multipleBytes_returnsLowerCaseHex STARTED

HexTests > lowerCase_multipleBytes_returnsLowerCaseHex PASSED

HexTests > customSeparatorAndLowerCase_combined STARTED

HexTests > customSeparatorAndLowerCase_combined PASSED

HexTests > emptySeparator_multipleBytes_producesContiguousHex STARTED

HexTests > emptySeparator_multipleBytes_producesContiguousHex PASSED

HexTests > defaultHex_emptyData_returnsEmptyString STARTED

HexTests > defaultHex_emptyData_returnsEmptyString PASSED