DPL Analysis: as<T>(cfg) for adjusting the types of configurables in expressions

[aalkin]

As Gandiva does not handle conversions with unsigned integer types internally, it is not trivial to apply filters for some of the columns. This feature creates a workaround, for example the following code

  Configurable<int> cvalue{"cvalue", 1, "test value"};
  Filter testFilter = o2::aod::track::tpcNClsShared < as<uint8_t>(cvalue);

will create a valid filter where cvalue will be properly updated and cast to uint8_t for comparison with the column of the same type, but it can be provided normally in configuration JSON as a simple int unlike for the uint8_t configurable that will be parsed as a character by C++.

[github-actions]

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