Resolve members of all imported modules in both __init__.py and submodules (PY-14454, PY-14615)

We used to resolve members __init__.py of imported packages using only
the __init__.py itself, i.e. without considering their submodules. Now
we do that and we also don't filter unimported submodules because we
cannot detect them reliably. They might be imported in other modules
via some import chain.

python/testData/inspections/PyUnresolvedReferencesInspection/ImplicitlyImportedSubModule/a.py

@@ -0,0 +1,5 @@
+import pkg1.m1
+
+print(pkg1.m2)
+print(pkg1.<warning descr="Cannot find reference 'nonexistent' in 'imported module pkg1'">nonexistent</warning>)
+

python/testData/inspections/PyUnresolvedReferencesInspection/ImplicitlyImportedSubModule/pkg1/__init__.py

@@ -0,0 +1 @@
+

python/testData/inspections/PyUnresolvedReferencesInspection/ImplicitlyImportedSubModule/pkg1/m1.py

@@ -0,0 +1 @@
+import pkg1.m2

python/testData/inspections/PyUnresolvedReferencesInspection/ImplicitlyImportedSubModule/pkg1/m2.py

@@ -0,0 +1 @@
+

python/testData/inspections/PyUnresolvedReferencesInspection3K/NotImportedSubmodulesOfNamespacePackage/main.py

@@ -1,5 +0,0 @@
-import nspkg1.m2
-
-print(nspkg1.m2)
-print(nspkg1.<warning descr="Cannot find reference 'm3' in 'imported module nspkg1'">m3</warning>)
-print(nspkg1.<warning descr="Cannot find reference 'nssubpkg1' in 'imported module nspkg1'">nssubpkg1</warning>)

python/testData/inspections/unusedImport/unusedSubmodule/p1/m1.py

@@ -1 +0,0 @@
-a1 = 42

python/testData/inspections/unusedImport/unusedSubmodule/p1/m2.py

@@ -1 +0,0 @@
-a2 = -1

python/testData/inspections/unusedImport/unusedSubmodule/test1.py

@@ -1,3 +0,0 @@
-import p1.m1
-
-print(p1.<warning descr="Cannot find reference 'm2' in 'imported module p1'">m2</warning>.a2)

python/testData/resolve/multiFile/fromImportSubModuleDunderAll/FromImportSubModuleDunderAll.py

@@ -0,0 +1,4 @@
+from pkg1 import m1
+
+print(m1)
+#     <ref>

python/testData/resolve/multiFile/fromImportSubModuleDunderAll/pkg1/__init__.py

@@ -0,0 +1 @@
+__all__ = ['m1']

python/testData/resolve/multiFile/fromImportSubModuleDunderAll/pkg1/m1.py

@@ -0,0 +1,2 @@
+def foo():
+    pass

python/testData/resolve/multiFile/importSubModuleDunderAll/ImportSubModuleDunderAll.py

@@ -1,4 +1,4 @@
-from pkg1 import m1
+import pkg1.m1
 
-print(m1)
-#     <ref>
+print(pkg1.m1)
+#          <ref>