Add support for regular expressions in Tokenizers.Normalizer.replace/… #46

Job	Run time
NIF 2.15 - aarch64-apple-darwin (macos-11)	4m 1s
NIF 2.15 - aarch64-unknown-linux-gnu (ubuntu-20.04)	1m 33s
NIF 2.15 - aarch64-unknown-linux-musl (ubuntu-20.04)	1m 26s
NIF 2.15 - arm-unknown-linux-gnueabihf (ubuntu-20.04)	1m 31s
NIF 2.15 - riscv64gc-unknown-linux-gnu (ubuntu-20.04)	1m 16s
NIF 2.15 - x86_64-apple-darwin (macos-11)	2m 53s
NIF 2.15 - x86_64-pc-windows-gnu (windows-2019)	2m 54s
NIF 2.15 - x86_64-pc-windows-msvc (windows-2019)	2m 9s
NIF 2.15 - x86_64-unknown-linux-gnu (ubuntu-20.04)	1m 0s
NIF 2.15 - x86_64-unknown-linux-musl (ubuntu-20.04)	2m 7s
NIF 2.16 - aarch64-apple-darwin (macos-11)	3m 50s
NIF 2.16 - aarch64-unknown-linux-gnu (ubuntu-20.04)	1m 33s
NIF 2.16 - aarch64-unknown-linux-musl (ubuntu-20.04)	1m 31s
NIF 2.16 - arm-unknown-linux-gnueabihf (ubuntu-20.04)	1m 26s
NIF 2.16 - riscv64gc-unknown-linux-gnu (ubuntu-20.04)	1m 16s
NIF 2.16 - x86_64-apple-darwin (macos-11)	2m 44s
NIF 2.16 - x86_64-pc-windows-gnu (windows-2019)	3m 15s
NIF 2.16 - x86_64-pc-windows-msvc (windows-2019)	2m 26s
NIF 2.16 - x86_64-unknown-linux-gnu (ubuntu-20.04)	1m 19s
NIF 2.16 - x86_64-unknown-linux-musl (ubuntu-20.04)	1m 33s
	41m 43s

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