Cleanup get_json_object (#2232)

* Rewrite `json_generator`

* Debug print

* Cleanup header

* Add `const` and `static` qualifiers

* Cleanup

Signed-off-by: Nghia Truong <nghiat@nvidia.com>

* Faster name concatenation

Signed-off-by: Nghia Truong <nghiat@nvidia.com>

* Add case path enum

Signed-off-by: Nghia Truong <nghiat@nvidia.com>

* Fix `try_skip_children`

Signed-off-by: Nghia Truong <nghiat@nvidia.com>

* Construct path command async

* More cleanup

Signed-off-by: Nghia Truong <nghiat@nvidia.com>

* Add comment

Signed-off-by: Nghia Truong <nghiat@nvidia.com>

* Fix format

Signed-off-by: Nghia Truong <nghiat@nvidia.com>

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Signed-off-by: Nghia Truong <nghiat@nvidia.com>