hamba / avro / 13057432127

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feat: add CRC64-AVRO-LE fingerprint type (#491)

The Avro specification details a Single Object Encoding using a header
to associate a schema ID with an Avro payload. The ID is defined as the
CRC64 fingerprint in little-endian encoding.

The pkg/crc64 module only provides big-endian CRC64, and the CRC64-AVRO
fingerprint type is implemented as such. The specification does not
detail endianness of the CRC64-AVRO fingerprint itself (only when
embedded in an SOE header).

To avoid breaking existing CRC64-AVRO fingerprints, add a new
fingerprint type CRC64-AVRO-LE, identical to CRC64-AVRO except
little-endian.

Add NewWithByteOrder and SumWithByteOrder top-level functions to crc64
so users can configure the hasher to use a specific byte order.

Add tests and benchmarks for the SumWithByteOrder function.

Fixes #489.

Co-authored-by: Nicholas Wiersma <nick@wiersma.co.za>

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