src/basic: rename uid-alloc-range.[ch] to uid-classification.[ch]

We had both uid-range.h and uid-alloc-range.h. The latter now contains helpers
like {uid,gid}_is_{system,dynamic,container}(), uid_for_system_journal(), so
the existing name is outdated. I think the uid-range.[ch] should stay separate
because it has a bunch of helpers for parsing and printing of uid ranges. So
let's rename as in $subject to better reflect the contents of the file and make
the two sets of files harder to confuse.

src/shared/condition.c

@@ -59,7 +59,7 @@
 #include "string-util.h"
 #include "tomoyo-util.h"
 #include "tpm2-util.h"
-#include "uid-alloc-range.h"
+#include "uid-classification.h"
 #include "user-util.h"
 #include "virt.h"
 

src/shared/group-record.c

@@ -2,7 +2,7 @@
 
 #include "group-record.h"
 #include "strv.h"
-#include "uid-alloc-range.h"
+#include "uid-classification.h"
 #include "user-util.h"
 
 GroupRecord* group_record_new(void) {

src/shared/user-record.c

@@ -16,7 +16,7 @@
 #include "rlimit-util.h"
 #include "string-table.h"
 #include "strv.h"
-#include "uid-alloc-range.h"
+#include "uid-classification.h"
 #include "user-record.h"
 #include "user-util.h"