Fixes and tests for Geometry, add support for float value coords

[cxnt]

Add tests for the following geometries:

• Bitmap
• AlphaMask
• Polygon
• Polyline
• Point
• PointLocation
• Rectangle
• Graph

Update annotation_api methods with integer_coords flag

Add changes to support float value type coordinates:

• Bitmap:
  • Update _draw_contour_impl to support float values. Values will be rounded for cv2.drawContours()
  • Fix typo in docstring
• Geometry:
  • Fix typo in docstring
• geometry.helpers.py:
  • _geometry_to_mask_base() func fix AlphaMask to Bitmap convertion
• Point:
  • remove round() call in constructor to preserve row, col values as is
  • update _draw_impl and _draw_contour_impl methods to use rounded values for cv2.circle() to work
• PointLocation
  • remove round() call in constructor to preserve row, col values as is
  • Update row and col docstrings
• Polygon
  • Update crop() method to call row_col_list_to_points() method with do_round flag set to False
  • Update approx_dp() method to call row_col_list_to_points() method with do_round flag set to False
  • Update _draw_impl method to use rounded exterior values for cv2.fillPoly()
  • Update _draw_contour_impl method to use rounded exterior values for cv2.polylines()
• Polyline:
  • Update _draw_contour_impl method to use rounded exterior values for cv2.polylines()
• Rectangle:
  • Update _transform() method to return Rectangle without rounding corner coordinates
  • Update _draw_contour_impl method to use rounded corner coordinates values for cv2.rectangle()
  • Update get_cropped_numpy_slice() method to crop Rectangle with rounded corner coordinates
• VectorGeometry:
  • Update docstring annotations
  • Update exterior_np and interior properties to return np.array with float values
  • Update to_bbox() method to return Rectangle without rounded corner coordinates
  • Add _round_exterior_interior_coords() and _round_exterior_interior_coords_np() methods