make imports-exports tests more complex

aqua/examples/imports_exports/export2.aqua

@@ -1,5 +1,7 @@
 module Export declares foobar, foo
 
+import Op as Noop from "@fluencelabs/aqua-lib/builtin.aqua"
+
 func bar() -> string:
     <- " I am MyFooBar bar"
 
@@ -7,6 +9,7 @@ func foo() -> string:
     <- "I am MyFooBar foo"
 
 func foobar() -> []string:
+    Noop.noop()
     res: *string
     res <- foo()
     res <- bar()

aqua/examples/imports_exports/export3.aqua

@@ -1,5 +1,8 @@
 -- exports3.aqua
 module Export3 declares *
 
+import Op as Noop from "@fluencelabs/aqua-lib/builtin.aqua"
+
 func foo() -> string:
+    Noop.noop()
     <- "I am MyFooBar foo"

aqua/examples/imports_exports/exports.aqua

@@ -1,5 +1,7 @@
 module Exports declares some_string, MyExportSrv, EXPORT_CONST, some_random_func
 
+import Op as Noop from "@fluencelabs/aqua-lib/builtin.aqua"
+
 export some_string as string_from_lib
 export MyExportSrv
 
@@ -9,6 +11,7 @@ service MyExportSrv("my_export_srv"):
   another_str() -> string
 
 func some_string() -> string:
+  Noop.noop()
   <- "some_string_func"
 
 func some_random_func() -> string:

aqua/examples/imports_exports/import3.aqua

@@ -1,10 +1,12 @@
 -- imports3.aqua
 module Import3 declares *
+import Op as Noop from "@fluencelabs/aqua-lib/builtin.aqua"
 
 export foo_wrapper
 
 use "export3.aqua"
 
 func foo_wrapper() -> string:
+    Noop.noop()
     z <- Export3.foo()
     <- z

aqua/examples/imports_exports/imports.aqua

@@ -2,17 +2,22 @@ import decl_foo, decl_bar from "declare.aqua"
 use DECLARE_CONST, SuperFoo, DECLARE_CONST2 as DC2 from "declare.aqua" as Declare
 import Op as Noop from "@fluencelabs/aqua-lib/builtin.aqua"
 import some_string, MyExportSrv, EXPORT_CONST from "exports.aqua"
+use "export3.aqua"
 
 service StringService("string_service"):
     concat(a: string, b: string) -> string
 
 func concat_foobars() -> string:
+    Noop.noop()
+    Export3.foo()
     res1 <- decl_foo()
     res2 <- decl_bar()
     res3 <- StringService.concat(res1, res2)
     res4 <- Declare.SuperFoo.small_foo()
+    Noop.noop()
     res5 <- StringService.concat(res3, res4)
     res6 <- StringService.concat(res5, EXPORT_CONST)
     res7 <- StringService.concat(res6, Declare.DECLARE_CONST)
+    Noop.noop()
     res8 <- StringService.concat(res7, Declare.DC2)
     <- res8