Optimize UUID conversion to and from String

[f4b6a3]

Optimize UUID conversion to and from String

[fabiolimace]

Now the method UuidConverter#fromString(String) is 5x faster than UUID#fromString(String) in JDK 8 and 11.

Now the method UuidConverter#toString(String) is 7x faster than
UUID#toString() in JDK 8.

Benchmark in JDK 8:

Benchmark                           Mode  Cnt      Score     Error   Units
Throughput.UUID_fromString         thrpt    5   1917,663 ±  58,287  ops/ms
Throughput.UUID_toString           thrpt    5   2897,979 ±  99,724  ops/ms
Throughput.UuidCreator_fromString  thrpt    5  10230,760 ± 106,844  ops/ms
Throughput.UuidCreator_toString    thrpt    5  20800,729 ± 220,021  ops/ms

Benchmark in JDK 11:

Benchmark                           Mode  Cnt      Score     Error   Units
Throughput.UUID_fromString         thrpt    5   7900,104 ±  78,608  ops/ms
Throughput.UUID_toString           thrpt    5  31687,104 ± 204,545  ops/ms (*)
Throughput.UuidCreator_fromString  thrpt    5   9635,343 ±  62,319  ops/ms
Throughput.UuidCreator_toString    thrpt    5  20652,287 ± 336,251  ops/ms

In JDK9+ UUID#toString() is faster.

Benchmark project:
https://github.com/fabiolimace/uuid-creator-benchmark

[fabiolimace]

Released version 3.1.2.