Add set_fact_persistent action and module. (#26153)

* Add 'cacheable' param to  set_fact action and module.

Used just like set_fact, except facts set with cacheable: true
will be stored in the fact cache if fact caching is enabled.

set_fact normally only sets facts in the non_persistent_fact_cache, so they
are lost between invocations.

* update set_facts docs

* use 'ansible_facts_cacheable' in module/actions result

* pop fact cacheable related items out of args/results

We dont want to use 'ansible_facts_cacheable' result item
or 'cacheable' arg as actual facts, so pop them out of the
dicts.

test/integration/targets/set_fact/aliases

@@ -0,0 +1 @@
+posix/ci/group3

test/integration/targets/set_fact/runme.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+set -eux
+
+MYTMPDIR=$(mktemp -d 2>/dev/null || mktemp -d -t 'mytmpdir')
+trap 'rm -rf "${MYTMPDIR}"' EXIT
+
+ANSIBLE_CACHE_PLUGIN=jsonfile ANSIBLE_CACHE_PLUGIN_CONNECTION="${MYTMPDIR}" ansible-playbook -i ../../inventory "$@" set_fact_cached_1.yml
+
+ANSIBLE_CACHE_PLUGIN=jsonfile ANSIBLE_CACHE_PLUGIN_CONNECTION="${MYTMPDIR}" ansible-playbook -i ../../inventory "$@" set_fact_cached_2.yml
+
+ANSIBLE_CACHE_PLUGIN=jsonfile ANSIBLE_CACHE_PLUGIN_CONNECTION="${MYTMPDIR}" ansible-playbook -i ../../inventory --flush-cache "$@" set_fact_no_cache.yml
+

test/integration/targets/set_fact/set_fact_cached_1.yml

@@ -0,0 +1,46 @@
+---
+- name: the first play
+  hosts: localhost
+  tasks:
+    - name: show foobar fact before
+      debug:
+        var: ansible_foobar
+
+    - name: set a persistent fact foobar
+      set_fact:
+        ansible_foobar: 'blippy'
+        cacheable: true
+
+    - name: show foobar fact after
+      debug:
+        var: ansible_foobar
+
+    - name: assert ansible_foobar is correct value
+      assert:
+        that:
+          - ansible_foobar == 'blippy'
+
+    - name: set a non persistent fact that will not be cached
+      set_fact:
+        ansible_foobar_not_cached: 'this_should_not_be_cached'
+
+    - name: show ansible_foobar_not_cached fact after being set
+      debug:
+        var: ansible_foobar_not_cached
+
+    - name: assert ansible_foobar_not_cached is correct value
+      assert:
+        that:
+          - ansible_foobar_not_cached == 'this_should_not_be_cached'
+
+- name: the second play
+  hosts: localhost
+  tasks:
+    - name: show foobar fact after second play
+      debug:
+        var: ansible_foobar
+
+    - name: assert ansible_foobar is correct value
+      assert:
+        that:
+          - ansible_foobar == 'blippy'

test/integration/targets/set_fact/set_fact_cached_2.yml

@@ -0,0 +1,21 @@
+---
+- name: A second playbook run with fact caching enabled
+  hosts: localhost
+  tasks:
+    - name: show ansible_foobar fact
+      debug:
+        var: ansible_foobar
+
+    - name: assert ansible_foobar is correct value when read from cache
+      assert:
+        that:
+          - ansible_foobar == 'blippy'
+
+    - name: show ansible_foobar_not_cached fact
+      debug:
+        var: ansible_foobar_not_cached
+
+    - name: assert ansible_foobar_not_cached is not cached
+      assert:
+        that:
+          - ansible_foobar_not_cached is undefined

test/integration/targets/set_fact/set_fact_no_cache.yml

@@ -0,0 +1,21 @@
+---
+- name: Running with fact caching enabled but with cache flushed
+  hosts: localhost
+  tasks:
+    - name: show ansible_foobar fact
+      debug:
+        var: ansible_foobar
+
+    - name: assert ansible_foobar is correct value
+      assert:
+        that:
+          - ansible_foobar is undefined
+
+    - name: show ansible_foobar_not_cached fact
+      debug:
+        var: ansible_foobar_not_cached
+
+    - name: assert ansible_foobar_not_cached is not cached
+      assert:
+        that:
+          - ansible_foobar_not_cached is undefined