patch(DPE-9341) mongo db juju spaces support implement juju spaces support

[Gu1nness]

🏷️ Type of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Tooling and CI
• Dependencies upgrade or change
• Chores / refactoring

📝 Description

This PR implements support for juju spaces according to DA243.

It contains:

• Restriction of the IPs the server listens on to specific interfaces
• Restriction of the CIDRS that can be part of the cluster
• Restriction of the IPs shared to clients to the specific interfaces
• User authenticationRestriction in non sharded mode (not possible on sharded mode for a variety of reasons.

🧪 Manual testing steps

1. sudo lxc network create peers --type=bridge ipv4.address="10.137.180.1/24" ipv4.nat=True ipv6.address=none dns.mode=none
2. sudo lxc network create clients --type=bridge ipv4.address="10.137.181.1/24" ipv4.nat=True ipv6.address=none dns.mode=none
3. sudo lxc network set clients raw.dnsmasq "dhcp-option=3
dhcp-option=6"
4. sudo lxc network set peers raw.dnsmasq "dhcp-option=3
dhcp-option=6"
5. juju reload-spaces
6. juju add-space clients 10.137.181.1/24
7. juju add-space peers 10.137.180.1/24
8. juju deploy ./tests/charms/mongodb_test_charm/mongodb_ubuntu@24.04-amd64.charm --constraints spaces=peers,clients --bind "alpha database-peers=peers database=clients" -n3
9. juju deploy ./tests/integration/applications/client_relations_charm/application_ubuntu@24.04-amd64.charm --bind "alpha first-database=clients"
10. juju integrate mongodb application:first-database
11. The URI should contain IPs in the slash 10.137.181.1/24

🔬 Automated testing steps

TBD

✅ Checklist

• My code follows the code style of this project.
• I have added or updated any relevant documentation.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[Mehdi-Bendriss]

Thanks Neha! Great work! I only have questions, mainly on the localhost part