Features/perf improvment

[DarkaMaul]

Slither feels kind of slow sometimes, so this PR tries to tackle some bottlenecks observed during profiling.

Of note, I refrain from concurrent.futures and parallel processing for the moment, I think they are some nice quick wins to gain first.

Comparison

Without the PR

INFO:Slither:/Users/dm/Projects/openzeppelin-contracts analyzed (275 contracts)
slither --print  --detect all ~/Projects/openzeppelin-contracts  109,40s user 5,53s system 78% cpu 2:26,17 total

With the PR

INFO:Slither:/Users/dm/Projects/openzeppelin-contracts analyzed (275 contracts)
slither --print  --detect all ~/Projects/openzeppelin-contracts  74,72s user 5,38s system 76% cpu 1:44,56 total

Overall, **a 30% ** performance improvment gain.

Changes

• Using isinstance for ABC metaclass is extremely slow, so we reduce their usage
• As hash functions are computed heavily, simply their computation.

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