feat: Replace scheme call in get_vector_fields

[hpohekar]

closes #3512

Replaced scheme call in get_vector_fields()

[prmukherj]

@hpohekar, I think we can address all the scheme calls together in a PR? We can update the proto files as required for this. What do you think?

[seanpearsonuk]

@hpohekar, I think we can address all the scheme calls together in a PR? We can update the proto files as required for this. What do you think?

@prmukherj code change so far looks potentially OK (as far as I can tell). Isn't this approach OK, gradually removing the Scheme dependencies?

[prmukherj]

@hpohekar, I think we can address all the scheme calls together in a PR? We can update the proto files as required for this. What do you think?

@prmukherj code change so far looks potentially OK (as far as I can tell). Isn't this approach OK, gradually removing the Scheme dependencies?

Yes @seanpearsonuk, should be fine. Just wanted to take a look into all the calls once and decide, that's all.

[prmukherj]

Tested visualization with this update and seems to run correctly. So no effect.