Preserve identifiers when reconstructing AstMethod

[jasmith-hs]

An aliased macro function (aka a local macro function) can be defined which modifies the value of a non-primitive argument. These are parsed by the Ast parser as AstMethod rather than AstMacroFunction. The AstMethod and AstMacroFunction should reconstruct parameters in the same way so I am making that consistent, by actually using the EagerAstParameter's definition of how to reconstruct itself.

Another change I am making is defining a IdentifierPreservationStrategy enum which lets a DeferredParsingException know if it is thrown by one of these classes which forces preserving identifiers (this is done because of the possibility of modifying a variable. Modifying [] is different than modifying my_list, which starts as []). By adding this information, we know that the partially resolved value within the DeferredParsingException is done such that the necessary identifiers have been preserved. Previously, if preserveIdentifer == true, we'd ignore the result of the DeferredParsingException, and remake it which led to duplicate work and with the other change I'm making in this PR, would not allow the macro function temp variable logic to work.

These new tests demonstrate how we need to preserve foo_map, imagining that this .modify method does some modification on foo_map:

@Test
public void itPreservesNonDeferredIdentifier() {
  try {
    interpreter.resolveELExpression("deferred.modify(foo_map)", -1);
    fail("Should throw DeferredParsingException");
  } catch (DeferredParsingException e) {
    assertThat(e.getDeferredEvalResult()).isEqualTo("deferred.modify(foo_map)");
  }
}

@Test
public void itPreservesNonDeferredIdentifierWhenSecondParamIsDeferred() {
  try {
    interpreter.resolveELExpression("foo_list.modify(foo_map, deferred)", -1);
    fail("Should throw DeferredParsingException");
  } catch (DeferredParsingException e) {
    assertThat(e.getDeferredEvalResult())
      .isEqualTo("foo_list.modify(foo_map, deferred)");
  }
}