feat: mf_dttm macro and associated test

base/mf_dttm.sas

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+/**
+  @file
+  @brief Returns E8601DT26.6 if compatible else DATETIME19.3
+  @details Per our experience in [Data Controller for SAS]
+  (https://datacontroller.io) deployments, the E8601DT26.6 datetime format has
+  the widest support when it comes to pass-through SQL queries.
+
+  However, it is not supported in WPS or early versions of SAS 9 (M3 and below).
+
+
+  <h4> Related Macros </h4>
+  @li mf_dttm.test.sas
+
+  @author Allan Bowe
+**/
+
+%macro mf_dttm(
+)/*/STORE SOURCE*/;
+
+%if "&sysver"="9.2" or "&sysver"="9.3"
+  or ("&sysver"="9.4" and "%substr(&SYSVLONG,9,1)" le "3")
+  or "%substr(&sysver,1,1)"="4"
+  or "%substr(&sysver,1,1)"="5"
+%then %do;DATETIME19.3%end;
+%else %do;E8601DT26.6%end;
+
+%mend mf_dttm;
+
+

tests/crossplatform/mf_dttm.test.sas

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+/**
+  @file
+  @brief Testing mf_dttm macro
+
+  <h4> SAS Macros </h4>
+  @li mf_dttm.sas
+  @li mp_assert.sas
+  @li mp_assertscope.sas
+
+**/
+
+%global test1;
+
+%mp_assertscope(SNAPSHOT)
+%let test1=%mf_dttm();
+%mp_assertscope(COMPARE,ignorelist=test1)
+
+%mp_assert(
+  iftrue=("&test1"="DATETIME19.3" or "&test1"="E8601DT26.6"),
+  desc=Basic test,
+  outds=work.test_results
+)