Add Sentinel-2 to Harmonization tool

[kevinlacaille]

Is your feature request related to a problem? Please describe.
Our SDK only allows data harmonization with Dove Classic, however the openAPI spec has added Sentinel-2 as a target sensor for harmonization.

I propose we add Sentinel-2 as an option for harmonization to the Orders API.

Describe the solution you'd like

Current harmonization tool:

def harmonize_tool() -> dict:
    '''Create the API spec representation of a harmonize tool.

    Currently, only "PS2" (Dove Classic) is supported as a target sensor, and
    it will transform only items captured by “PS2.SD” (Dove-R).
    '''
    return _tool('harmonize', {'target_sensor': 'PS2'})

Proposed solution:

def harmonize_tool(target_sensor: str) -> dict:
    '''Create the API spec representation of a harmonize tool.

    Currently, only "PS2" (Dove Classic) and "Sentinel-2" are supported as 
    target sensors. Dove-R can only be transformed by PS2 and Sentinel-2 can 
    only transform surface reflectance bundles for PSScene 
    (ie., analytic_8b_sr_udm2, analytic_sr_udm2).
    '''
    return _tool('harmonize', {'target_sensor': target_sensor})

I also suggest adding a test for hamonization in tests/unit/test_order_request.py:

@pytest.mark.parametrize("target_sensor", ["PS2", "Sentinel-2"])
def test_harmonization_tool(target_sensor):
    ht = order_request.harmonize_tool(target_sensor)
    expected = {'harmonize': {'target_sensor': target_sensor}}
    assert ht == expected

Additional context
I would double check the sensor harmonization compatibility on the Dev Center.

[cholmes]

Added to b1 milestone. Consider this 'nice to have', not a blocker for release - if the key tickets land we can move it.

Your proposal looks good, but I'd adopt the language in the dev center more directly - the 'transformed by' / 'transform' language isn't super clear.

Currently, only "PS2" (Dove Classic) and "Sentinel-2" are supported as 
    target sensors. The Sentinel-2 target only harmonizes PSScene 
    surface reflectance bundle types (analytic_8b_sr_udm2, analytic_sr_udm2). 
    The PS2 target only works on analytic bundles
     from Dove-R (PS2.SD).