Add OpenSSL 3.3.x base64 decoder to benchmarks.

[krk]

This adds the current OpenSSL 3.3.x implementation to the benchmarks. Please feel free to resolve if this doesn't belong to simdutf benchmarks.

Sample execution on an Intel Cascade Lake CPU, which is detected as Haswell, because Cascade Lake does not support AVX512 VBMI2 and VPOPCNTDQ instructions.

./benchmark_base64 -d one.pem
# current system detected as haswell.
# loading files: .
# volume: 2717 bytes
# max length: 2717 bytes
# number of inputs: 1
# decode
memcpy                                   :  67.47 GB/s   9.35 GHz   0.14 c/b   0.20 i/b   1.41 i/c 
# the base64 data contains spaces, so we cannot use straigth libbase64::base64_decode directly
openssl3.3.x                             :   0.33 GB/s   4.46 GHz  13.40 c/b  37.06 i/b   2.77 i/c 
libbase64_space_decode                   :   0.82 GB/s   4.49 GHz   5.47 c/b  15.51 i/b   2.84 i/c 
node                                     :   1.47 GB/s   4.58 GHz   3.12 c/b  12.69 i/b   4.07 i/c 
simdutf::haswell                         :   6.41 GB/s   4.99 GHz   0.78 c/b   2.27 i/b   2.91 i/c 
simdutf::westmere                        :   5.01 GB/s   4.86 GHz   0.97 c/b   3.12 i/b   3.22 i/c 
simdutf::fallback                        :   2.25 GB/s   4.62 GHz   2.06 c/b   6.83 i/b   3.32 i/c 

./benchmark_base64 -d one-nospace.pem
# current system detected as haswell.
# loading files: .
# volume: 2676 bytes
# max length: 2676 bytes
# number of inputs: 1
# decode
memcpy                                   :  68.46 GB/s   9.59 GHz   0.14 c/b   0.19 i/b   1.39 i/c 
libbase64                                :  14.31 GB/s   5.22 GHz   0.36 c/b   0.84 i/b   2.31 i/c 
openssl3.3.x                             :   0.33 GB/s   4.41 GHz  13.47 c/b  37.29 i/b   2.77 i/c 
libbase64_space_decode                   :   1.91 GB/s   4.64 GHz   2.43 c/b   6.84 i/b   2.82 i/c 
node                                     :   1.64 GB/s   4.64 GHz   2.83 c/b  11.61 i/b   4.11 i/c 
simdutf::haswell                         :  11.65 GB/s   5.40 GHz   0.46 c/b   1.20 i/b   2.58 i/c 
simdutf::westmere                        :   7.87 GB/s   5.10 GHz   0.65 c/b   2.13 i/b   3.28 i/c 
simdutf::fallback                        :   2.50 GB/s   4.71 GHz   1.88 c/b   5.88 i/b   3.12 i/c 

[lemire]

Let us see if our tests pass!

[lemire]

Merging.