Add rebinning option for focused workspaces in polaris create pdf

This commit adds an option to rebin the focused/merged workspace with a delta_q paramiter in polaris create pdf.

re: #28415

scripts/Diffraction/isis_powder/polaris.py

@@ -65,6 +65,7 @@ class Polaris(AbstractInst):
                                                   cal_file_name=cal_file_name,
                                                   sample_details=self._sample_details,
                                                   delta_r=self._inst_settings.delta_r,
+                                                  delta_q=self._inst_settings.delta_q,
                                                   pdf_type=self._inst_settings.pdf_type,
                                                   freq_params=self._inst_settings.freq_params)
         return pdf_output

scripts/Diffraction/isis_powder/polaris_routines/polaris_algs.py

@@ -83,7 +83,7 @@ def save_unsplined_vanadium(vanadium_ws, output_path):
 
 
 def generate_ts_pdf(run_number, focus_file_path, merge_banks=False, q_lims=None, cal_file_name=None,
-                    sample_details=None, delta_r=None, pdf_type="G(r)", freq_params=None):
+                    sample_details=None, delta_r=None, delta_q=None, pdf_type="G(r)", freq_params=None):
     focused_ws = _obtain_focused_run(run_number, focus_file_path)
     focused_ws = mantid.ConvertUnits(InputWorkspace=focused_ws, Target="MomentumTransfer", EMode='Elastic')
 
@@ -105,7 +105,8 @@ def generate_ts_pdf(run_number, focus_file_path, merge_banks=False, q_lims=None,
     self_scattering_correction = mantid.RebinToWorkspace(WorkspaceToRebin=self_scattering_correction,
                                                          WorkspaceToMatch=focused_ws)
     focused_ws = mantid.Subtract(LHSWorkspace=focused_ws, RHSWorkspace=self_scattering_correction)
-
+    if delta_q:
+        focused_ws = mantid.Rebin(InputWorkspace=focused_ws, Params=delta_q)
     if merge_banks:
         q_min, q_max = _load_qlims(q_lims)
         merged_ws = mantid.MatchAndMergeWorkspaces(InputWorkspaces=focused_ws, XMin=q_min, XMax=q_max,

scripts/Diffraction/isis_powder/polaris_routines/polaris_param_mapping.py

@@ -17,6 +17,7 @@ attr_mapping = [
     ParamMapEntry(ext_name="calibration_mapping_file", int_name="cal_mapping_path"),
     ParamMapEntry(ext_name="config_file", int_name="config_file"),
     ParamMapEntry(ext_name="delta_r", int_name="delta_r", optional=True),
+    ParamMapEntry(ext_name="delta_q", int_name="delta_q", optional=True),
     ParamMapEntry(ext_name="do_absorb_corrections", int_name="do_absorb_corrections"),
     ParamMapEntry(ext_name="do_van_normalisation", int_name="do_van_normalisation"),
     ParamMapEntry(ext_name="file_ext", int_name="file_extension", optional=True),