code: @Nonnull
      public <M extends PMessage<M, F>, F extends PField>
      M getConfig(@Nonnull File configFile) throws ProvidenceConfigException {
          ConfigSupplier<M,F> supplier = resolveConfig(configFile);
          return supplier.get();
      }
docs: Get config for the given file.
  
  @param configFile The file to read config for.
  @param <M> The config message type.
  @param <F> The config message field type.
  @return The config message.
  @throws ProvidenceConfigException On config load failure.