feat: updating mf_getvarcount to allow filtering by column type

tests/crossplatform/mf_getvarcount.test.sas

@@ -0,0 +1,41 @@
+/**
+  @file
+  @brief Testing mf_getvarlist macro
+
+  <h4> SAS Macros </h4>
+  @li mf_getvarcount.sas
+
+**/
+
+data work.all work.nums(keep=num1 num2) work.chars(keep=char1 char2);
+  length num1 num2 8 char1 char2 char3 $4;
+  call missing (of _all_);
+  output;
+run;
+
+%mp_assert(
+  iftrue=(%mf_getvarcount(work.all)=5),
+  desc=%str(Checking for mixed vars),
+  outds=work.test_results
+)
+%mp_assert(
+  iftrue=(%mf_getvarcount(work.all,typefilter=C)=3),
+  desc=%str(Checking for char in mixed vars),
+  outds=work.test_results
+)
+%mp_assert(
+  iftrue=(%mf_getvarcount(work.all,typefilter=N)=2),
+  desc=%str(Checking for num in mixed vars),
+  outds=work.test_results
+)
+%mp_assert(
+  iftrue=(%mf_getvarcount(work.nums,typefilter=c)=0),
+  desc=%str(Checking for char in num vars),
+  outds=work.test_results
+)
+%mp_assert(
+  iftrue=(%mf_getvarcount(work.chars,typefilter=N)=0),
+  desc=%str(Checking for num in char vars),
+  outds=work.test_results
+)
+