0.3.0: Extract all parameters of a hash

Added

• Expose all parameters of a hash through new readers on Argon2id::Password: namely, type, version, m_cost, t_cost, and parallelism

Changed

• Remove the dependency on the base64 gem by inlining the definition of Base64.decode64 (thanks to @etiennebarrie for the tip)

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SHA256 checksums:

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1c1f46559575e802453ec3443e3c786bd3dc791157ef155a2442ef1f742fd27f  argon2id-0.3.0-arm-linux.gem
9d49de6840942b48d020dddd422a1577fde7289ccb08a637bdb29f4a09b4e181  argon2id-0.3.0-arm64-darwin.gem
5ba01e89f7bce775f5e523a16a3e9dd68a0fbb19ab03d8953625359000649e16  argon2id-0.3.0-x64-mingw-ucrt.gem
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2201b32263ba45875b00416bf521542dac63931eee59fc93b3b7ce2f309bc395  argon2id-0.3.0-x86_64-darwin.gem
35e79da989692c9a2d00e4cbb4a9ba5547b2e9170ace81a9a2450036c50c2da4  argon2id-0.3.0-x86_64-linux.gem
365db2b5612bc5f4ce28b8167b94716b2b541323c96090bb44099f5474d08b9f  argon2id-0.3.0.gem