Make all example files downloadable (#1126)

* Use pydpf/update_examples branch on examples_data repo

* Delete all example files kept in the repo

* Switch all find_* methods in examples.py to using downloads._download_file

* Adapt tests

* Solve circular import

* Fix style

* Fix examples_data branch

* Fix .rth

* Update conftest.py

* Fix examples _module_path

* update test_delete_downloaded_files

* Support examples.static_rst and the like lazy evaluation

* Update test_examples.py

* examples.find_* methods now work the same as download_*

* Switch to equivalent pydpf-post branch

* Try update test_multi_server.py

* Try update test_multi_server.py

* Switch back to master branch for example_repo

* Switch back to master branch for PyDPF-Post

* Clean-up examples.py

src/ansys/dpf/core/examples/__init__.py

@@ -1,2 +1,47 @@
 from .examples import *
 from .downloads import *
+
+
+# called if module.<name> fails
+def __getattr__(name):
+    if name == "simple_bar":
+        global simple_bar
+        simple_bar = find_simple_bar()
+        return simple_bar
+    elif name == "static_rst":
+        global static_rst
+        static_rst = find_static_rst()
+        return static_rst
+    elif name == "complex_rst":
+        global complex_rst
+        complex_rst = find_complex_rst()
+        return complex_rst
+    elif name == "multishells_rst":
+        global multishells_rst
+        multishells_rst = find_multishells_rst()
+        return multishells_rst
+    elif name == "electric_therm":
+        global electric_therm
+        electric_therm = find_electric_therm()
+        return electric_therm
+    elif name == "steady_therm":
+        global steady_therm
+        steady_therm = find_steady_therm()
+        return steady_therm
+    elif name == "transient_therm":
+        global transient_therm
+        transient_therm = find_transient_therm()
+        return transient_therm
+    elif name == "msup_transient":
+        global msup_transient
+        msup_transient = find_msup_transient()
+        return msup_transient
+    elif name == "simple_cyclic":
+        global simple_cyclic
+        simple_cyclic = find_simple_cyclic()
+        return simple_cyclic
+    elif name == "distributed_msup_folder":
+        global distributed_msup_folder
+        distributed_msup_folder = find_distributed_msup_folder()
+        return distributed_msup_folder
+    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")