text: Title: [BUG] encode_axis binding wrong field
  Body: **Describe the bug**
  
  `g.encode_axis(rows=[...]).plot()` has no effect
  
  It appears to not be under key `"node_encodings"`, so a no-op. Not sure why the server is accepting.
  
  **To Reproduce**
  
  Works:
  
  ```python
  g2 = g._complex_encodings['node_encodings'] = {
      'current': {},
      'default': {
          "pointAxisEncoding": {
              "graphType": "point",
              "encodingType": "axis",
              "variation": "categorical",
              "attribute": "degree",
              "rows": [
                  {"label": "a",  "r": 60, "internal": True },
                  {"label": "b",  "r": 120, "external": True },
              ]
          }
      }
  }
  g2.plot()
  ```
  
  Doesn't:
  
  ```python
  g2 =  g.encode_axis([
                    {'r': 14, 'external': True, 'label': 'outermost'},
                    {'r': 12, 'external': True},
                    {'r': 10, 'space': True},
                    {'r': 8, 'space': True},
                    {'r': 6, 'internal': True},
                    {'r': 4, 'space': True},
                    {'r': 2, 'space': True, 'label': 'innermost'}
                  ])
  g2.plot()
  ```
  
  Note lack of field `"node_encodings"` at https://github.com/graphistry/pygraphistry/blob/37f70e79a87c3122968c69e6e72e0d253a677c14/graphistry/PlotterBase.py#L373 
  
  **Expected behavior**
  
  Radial axis
  
  **Actual behavior**
  
  Viz without axis
  
  **PyGraphistry API client environment**
  
  0.28.1
  
  
  