Add modular coverage cases for dictionary in cadl-ranch

[v-jiaodi]

Fixes https://github.com/Azure/autorest.typescript/issues/2115, https://github.com/Azure/autorest.typescript/issues/2216

Added List: 1.dictionary

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[microsoft-github-policy-service[bot]]

Hi @v-jiaodi. Thank you for your contribution. Since there hasn't been recent engagement, we're going to close this out. Feel free to respond with a comment containing "/reopen" if you'd like to continue working on these changes. Please be sure to use the command to reopen or remove the "no-recent-activity" label; otherwise, this is likely to be closed again with the next cleanup pass.