[Improvement] Support `declareTable` and mark `createEmptyTable` as deprecated for Lance REST service

### What would you like to be improved?

According to https://github.com/lance-format/lance-namespace/pull/284 and https://github.com/lance-format/lance-namespace/blob/main/java/lance-namespace-apache-client/docs/CreateEmptyTableRequest.md, `createEmptyTable` will be replaced with `declareTable` by the latest spec.

### How should we improve?

We can't hold until the related concept has been cleared.

Start with the Lance REST service and compare the current createEmptyTable operation with the declareTable API described in the linked Lance Namespace pull request and CreateEmptyTableRequest documentation. Done means declareTable is supported and createEmptyTable is marked deprecated in accordance with the latest specification; the issue does not name source files or tests.

Written by the indexing model from the issue text.