eolian: make hashes beta-only for now

They're not completely settled on and we don't even know if we want
them at all. So let's make them beta only for now.

Ref T8050.

src/lib/eolian/database_validate.c

@@ -293,6 +293,11 @@ _validate_type(Validate_State *vals, Eolian_Type *tp)
                 int kwid = eo_lexer_keyword_str_to_id(tp->base.name);
                 if (kwid > KW_void)
                   tp->ownable = EINA_TRUE;
+                if (kwid == KW_hash && vals->stable)
+                  {
+                     _eo_parser_log(&tp->base, "hashes not allowed in stable context");
+                     return EINA_FALSE;
+                  }
                 Eolian_Type *itp = tp->base_type;
                 /* validate types in brackets so transitive fields get written */
                 while (itp)

src/tests/eolian/data/owning.eo

@@ -1,4 +1,4 @@
-class Owning {
+class @beta Owning {
    methods {
      test1 {
        params {

src/tests/eolian_cxx/complex.eo

@@ -58,12 +58,12 @@ class Complex extends Efl.Object
            l: array<string> @move;
          }
       }
-      inhash {
+      inhash @beta {
          params {
            l: hash<string, string>;
          }
       }
-      inhashown {
+      inhashown @beta {
          params {
            l: hash<string, string> @move;
          }
@@ -139,12 +139,12 @@ class Complex extends Efl.Object
            @out l: array<string> @move;
          }
       }
-      outhash {
+      outhash @beta {
          params {
            @out l: hash<string, string>;
          }
       }
-      outhashown {
+      outhashown @beta {
          params {
            @out l: hash<string, string> @move;
          }