Transaction Store and Load API

[kontura]

Operations such as System Upgrade, Offline Upgrade, History Replay, History Redo, History Store and others require an API for storing and loading transactions.

• [x] Add an API to store (serialize) a transaction into a JSON data format. We will need to be able to serialize both base::transaction and transaction::transaction (history transaction).
• [x] Add API to load the JSON serialized transaction into a Goal.

The first part is done but we still need:

• [x] Fix environments handling - requires ABI break
• [x] Add groups/environments replaying without loaded repos
• [ ] Verify functionality without loading repos
• [ ] Enable/Add CI tests
• [ ] Integrate running without loading repos into offline command (system-upgrade)

The API should support packages (RPMs), groups, environments and potentially also modules.

[kontura]

The first draft of the API is in PR: https://github.com/rpm-software-management/dnf5/pull/978

[evan-goode]

Second draft of the API is PR https://github.com/rpm-software-management/dnf5/pull/1005

[jan-kolarik]

Related issue to the mentioned ABI break: https://github.com/rpm-software-management/dnf5/issues/1025.

[kontura]

Comps and running without loading repos PR: https://github.com/rpm-software-management/dnf5/pull/1264

[jan-kolarik]

Make sure these scenarios are covered:

• https://github.com/rpm-software-management/dnf/issues/2031
• https://issues.redhat.com/browse/RHEL-17494

Related PR in libdnf:

• https://github.com/rpm-software-management/libdnf/pull/1644.

[kontura]

The API is finished.