MAINT: Separate adding SNRs per IFO to a sample into a new function

Moves code snippet which adds IFO snrs to a sample into a separate function within the Likelihood. Thus different likelihoods may define this differently if they have different SNRs which must be computed.

bilby/gw/likelihood/base.py

@@ -18,6 +18,7 @@ from typing import TYPE_CHECKING, Any
 if TYPE_CHECKING:
     from bilby.gw.detector.interferometer import Interferometer
 
+
 class GravitationalWaveTransient(Likelihood):
     """ A gravitational-wave transient likelihood object
 
@@ -1134,9 +1135,15 @@ class GravitationalWaveTransient(Likelihood):
             lal_version=self.lal_version,
             lalsimulation_version=self.lalsimulation_version)
 
-    def add_interferometer_snrs_to_sample(ifo : Interferometer, ifo_index : int, new_samples : list, sample : Any) -> None:
-        """For use in gw.conversion.compute_snrs(). Attaches method to likelihood so alternate likelihoods may implement their own method.
-        
+    def add_interferometer_snrs_to_sample(
+        ifo : Interferometer,
+        ifo_index : int,
+        new_samples : list,
+        sample : Any
+    ) -> None:
+        """For use in gw.conversion.compute_snrs().
+        Attached here so alternate likelihoods may implement their own method.
+
         Parameters
         ==========
         ifo : bilby.gw.interferometer.Interferometer
@@ -1157,4 +1164,4 @@ class GravitationalWaveTransient(Likelihood):
             optimal_snrs.append(new_sample[ifo_index].optimal_snr_squared.real ** 0.5)
 
         sample[mf_key] = matched_filter_snrs
-        sample[optimal_key] = optimal_snrs
\ No newline at end of file
+        sample[optimal_key] = optimal_snrs