add metadata prop to lock api

[theonefx]

Description

add metadata prop to lock api

Please reference the issue this PR will close: https://github.com/dapr/dapr/issues/8674

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• [x] Code compiles correctly
• [ ] Created/updated tests
• [ ] Extended the documentation / Created issue in the https://github.com/dapr/docs/ repo: dapr/docs#[issue number]

[theonefx]

/test

[theonefx]

@yaron2

[nelson-parente]

docs issue: https://github.com/dapr/docs/issues/4790

[marcduiker]

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