feat: mp_lockXXX macros f

These macros provide a centralised approach for locking tables where updates can happen in multiple passes.  The mp_lockfilecheck macro will also verify the ability to create a SAS lock (if a v9 library engine, and not a view)

tests/crossplatform/mp_lockfilecheck.test.sas

@@ -0,0 +1,36 @@
+/**
+  @file
+  @brief Testing mp_lockfilecheck macro
+
+  <h4> SAS Macros </h4>
+  @li mp_lockfilecheck.sas
+  @li mp_assert.sas
+
+**/
+
+
+/* check for regular lock */
+data work.test; a=1;run;
+%mp_lockfilecheck(work.test)
+
+%mp_assert(
+  iftrue=(&syscc=0),
+  desc=Checking regular table can be locked,
+  outds=work.test_results
+)
+
+
+/* check for unsuccessful lock */
+%global success abortme;
+%let success=0;
+%macro mp_abort(iftrue=,mac=,msg=);
+  %if &abortme=1 %then %let success=1;
+%mend mp_abort;
+
+%mp_lockfilecheck(sashelp.class)
+
+%mp_assert(
+  iftrue=(&success=1),
+  desc=Checking sashelp table cannot be locked,
+  outds=work.test_results
+)