Support nested JSONPath expressions - inner most expressions resolving first

[ryanmurf]

Example:

    @Test
    public void testReplaceIndex() throws Exception {
        Map<String, Object> map = new HashMap<>();
        map.put("name", "conductor");
        map.put("index", 1);
        map.put("recordIds", List.of(1, 2, 3));

        Map<String, Object> input = new HashMap<>();
        input.put("k1", "${recordIds[${index}]}");

        Object jsonObj = objectMapper.readValue(objectMapper.writeValueAsString(map), Object.class);

        Map<String, Object> replaced = parametersUtils.replace(input, jsonObj);
        assertNotNull(replaced);

        assertEquals(2, replaced.get("k1"));
    }

[v1r3n]

I think this is a great idea.

[ryanmurf]

#3764