feat: add support for importing multiple provisioners files from a local directory

[Venkatesh1505]

Description

This PR makes two changes:

1. Replace uriget.GetFile with uriget.GetFiles for the --provisioners flag in the init command. When a local directory path is passed, all files in
   the directory are imported individually, sorted by name. Single file paths and remote URIs continue to work as before.

2. Rework SaveProvisionerToDirectory to drop the time-based prefix from saved provisioner filenames. Instead, the original base name from the
   source URI is preserved along with a hash suffix. This ensures that files with explicit ordering prefixes (e.g., 10-, 20-) retain their intended
   load order when read from the state directory.

Depends on: score-spec/score-go#(180) — adds the GetFiles function to the uriget package.

Note: This PR currently uses a local replace directive in go.mod pointing to the score-go branch. This should be updated to the released score-go
version before merging.

What does this PR do?

Relates to score-spec/score-go#177

Enables users to pass a local directory to --provisioners during score-compose init, importing all provisioner files from that directory in a
single command. Previously, each file had to be specified individually.

Before:
score-compose init
--provisioners ./provisioners/10-service.provisioners.yaml
--provisioners ./provisioners/20-redis.provisioners.yaml

After:
score-compose init --provisioners ./provisioners/

The saved filenames now preserve the original name and ordering:
Before: meaningless base64 names
f0B3kQ2x.a8Dk3mP9qR.provisioners.yaml

After: readable, ordered

10-service.a8Dk3mP9qR.provisioners.yaml
20-redis.b7Ck2lO8pQ.provisioners.yaml

Types 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)
• New chore (expected functionality to be implemented)

Checklist:

• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• I've signed off with an email address that matches the commit author.

[mathieu-benoit]

This LGTM, awesome!

Really appreciate the rigorous research, documentation and tests, really great to review with such context!

I just have a question for the stdin scenario. Let's validate this before approving this dependency score-spec/score-go#180.

Notes:

• Not approving yet as we'll need to approve/merge/release the score-go dependency first
• It's totally fine to just implement this for file. We can release this when ready and already have end users using it and provide feedback if needed. For oci and git will come later in future PR.

[mathieu-benoit]

LGTM, thanks, @Venkatesh1505!

Let's do this for score-k8s now 😄

[mathieu-benoit]

FYI: associated docs updated accordingly: score-spec/docs#278