[Feature]: Method to set wind direction by upstream turbines
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Description
The dataframe_manipulations module includes the function set_ws_by_upstream_turbines but there is no equivalent for wind direction. However, field observations have shown that wind directions measured at waked turbines can contain biases relative to unwaked turbines. This is illustrated in the paper Schepers, J. G., et al., "Analysis of wake measurements from the ECN Wind Turbine Test Site Wieringermeer, EWTW," Wind Energy, 2012., where the authors show that the wind direction measured at a partially waked turbine is biased away from the side where the turbine is waked. This phenomenon could potentially cause the wind direction based on all turbines to be biased.
To solve this, a method set_wd_by_upstream_turbines (and set_wd_by_upstream_turbines_in_radius) could be created. Since a wind direction signal is needed to determine the set of upstream turbines, this function could first use the mean wind direction over all turbines to estimate the set of unwaked turbines, then use the unwaked turbines to compute the final wind direction signal.
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