add context in evaluate transform arguments

[arcosa]

We have expressions of the following type:

exp1|transform(exp2)

If exp2 depends on the context, it is currently executed as transform(exp1, None).

This is because if exp2 depends on the context, it is unable to evaluate the correct value. By adding the context in the evaluation of the transformation arguments, it allows us to evaluate expressions of that type.

For expressions where exp2 does not depend on the context, we don't have that problem.

An example would be an expression of the type:

0|rnd(max)

with max in the context having a value of 10.
It should apply rnd(0,10) but instead it applies rnd(0,None).

On the other hand,

0|rnd(10)

does it correctly

[fgalan]

While this PR gets hopefully merged in pyjexl (and a version included the fix gets released) we have build a wrapper named tcjexl (https://github.com/telefonicasc/tcjexl) which 0.2.0 release (https://github.com/telefonicasc/tcjexl/tree/0.2.0) includes a modify copy of pyjexl with the patch in this PR applied.