Add compiler profile to prioritize memory speed #167
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Add a builder for the compiler object. This builder is only used for the moment to add modules, but more will be added. This builder solves an issue when adding modules, in that existing modules could not be replaced by the one added, which made for a much worse API and the impossibility of overwriting a module configuration with a new one. This is now solved as with a CompilerBuilder, it is guaranteed that added modules have not yet been used by any rules, so they can be replaced. This makes creating a compiler a bit more complex when custom modules are added, but this is not a huge change.
This avoids the "too many arguments" lint on Scanner::new, and will scale better.
Add a compiler profile option to CompilerBuilder. This will allow picking between: - speed: prioritize scanning speed (current impl & default) - memory: prioritize memory usage - automatic: pick between the two depending on the size of the rules. The memory profile is only implemented for the aho-corasick for the moment. Changing the regex engine used for validators could be an option, however it isn't trivial to do, and we would make implementing an "automatic" profile harder, since "automatic" only works if compilation is done when converting the compiler to the scanner.
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TODO: would be nice to run all tests on both profiles