adding new scripts for debian12

- "users_homedir_is_configured.sh" is a concatenation of different existing scripts:
        - [users_homedir_exist.sh](https://github.com/ovh/debian-cis/blob/master/bin/hardening/users_homedir_exist.sh)
        - [users_homedir_ownership.sh](https://github.com/ovh/debian-cis/blob/master/bin/hardening/users_homedir_ownership.sh)
        - [check_user_dir_perm.sh](https://github.com/ovh/debian-cis/blob/master/bin/hardening/check_user_dir_perm.sh)
And so is its test
It will be mapped as 7.2.9 for debian 12

- The following scripts are a split from [5.3.1_enable_pwquality.sh](https://github.com/ovh/debian-cis/blob/master/bin/hardening/enable_pwquality.sh):
        - enable_libpam_pwquality.sh    -> will be mapped as 5.3.2.3
        - install_libpam_pwquality.sh   -> will be mapped as 5.3.1.3
        - password_complexity.sh        -> will be mapped as 5.3.3.2.3
        - password_min_length.sh        -> will be mapped as 5.3.3.2.2

The others are scripts are new.
They will be mapped as follow for debian 12 CIS :

- apt_gpg_is_configured.sh                      -> 1.2.1.1
- dev_shm_separate_partition.sh                 -> 1.2.2.1
- install_iptables.sh                           -> 4.3.1.1
- install_nftables.sh                           -> 4.2.1
- password_consecutive_characters.sh            -> 5.3.3.2.4
- password_max_sequential_characters.sh         -> 5.3.3.2.5

bin/hardening/install_libpam_pwquality.sh

@@ -0,0 +1,66 @@
+#!/bin/bash
+
+# run-shellcheck
+#
+# CIS Debian Hardening
+#
+
+#
+# Ensure libpam-pwquality is installed (Automated)
+#
+
+set -e # One error, it's over
+set -u # One variable unset, it's over
+
+# shellcheck disable=2034
+HARDENING_LEVEL=2
+# shellcheck disable=2034
+DESCRIPTION="Ensure libpam-pwquality is installed "
+
+PACKAGE='libpam-pwquality'
+
+# This function will be called if the script status is on enabled / audit mode
+audit() {
+    is_pkg_installed "$PACKAGE"
+    if [ "$FNRET" != 0 ]; then
+        crit "$PACKAGE is not installed!"
+    else
+        ok "$PACKAGE is installed"
+    fi
+}
+
+# This function will be called if the script status is on enabled mode
+apply() {
+    is_pkg_installed "$PACKAGE"
+    if [ "$FNRET" = 0 ]; then
+        ok "$PACKAGE is installed"
+    else
+        crit "$PACKAGE is absent, installing it"
+        apt_install "$PACKAGE"
+    fi
+}
+
+# This function will check config parameters required
+check_config() {
+    :
+}
+
+# Source Root Dir Parameter
+if [ -r /etc/default/cis-hardening ]; then
+    # shellcheck source=../../debian/default
+    . /etc/default/cis-hardening
+fi
+if [ -z "$CIS_LIB_DIR" ]; then
+    echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
+    echo "Cannot source CIS_LIB_DIR variable, aborting."
+    exit 128
+fi
+
+# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
+if [ -r "${CIS_LIB_DIR}"/main.sh ]; then
+    # shellcheck source=../../lib/main.sh
+    . "${CIS_LIB_DIR}"/main.sh
+else
+    echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_LIB_DIR in /etc/default/cis-hardening"
+    exit 128
+fi