chore: make get admin sync

[luoyuxia]

Purpose

Linked issue: close #xxx

Brief change log

Tests

API and Format

Documentation

[Copilot]

Pull request overview

This PR makes get_admin a synchronous (non-async) accessor on the Fluss connection, and updates documentation, examples, bindings, and integration tests to match the new API shape.

Changes:

• Change Rust FlussConnection::get_admin from async to synchronous, returning a cached admin client.
• Update Rust/Python user-guide docs and examples to remove await for get_admin.
• Update Rust integration tests and Python/C++ bindings/tests to use the synchronous get_admin.

Reviewed changes

Copilot reviewed 29 out of 29 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
website/docs/user-guide/rust/example/partitioned-tables.md	Update Rust example to call get_admin() synchronously.
website/docs/user-guide/rust/example/log-tables.md	Update Rust example to call get_admin() synchronously.
website/docs/user-guide/rust/example/index.md	Update Rust quickstart to call get_admin() synchronously.
website/docs/user-guide/rust/example/admin-operations.md	Update Rust snippet to call get_admin() synchronously.
website/docs/user-guide/rust/error-handling.md	Update Rust error-handling examples to call get_admin() synchronously.
website/docs/user-guide/rust/api-reference.md	Document get_admin as synchronous.
website/docs/user-guide/python/example/log-tables.md	Update Python example to call get_admin() synchronously.
website/docs/user-guide/python/example/index.md	Update Python quickstart to call get_admin() synchronously.
website/docs/user-guide/python/example/admin-operations.md	Update Python snippet to call get_admin() synchronously.
website/docs/user-guide/python/api-reference.md	Document get_admin as synchronous in Python API table.
crates/fluss/tests/integration/table_remote_scan.rs	Update integration test to remove .await from get_admin.
crates/fluss/tests/integration/sasl_auth.rs	Update SASL integration tests to remove .await from get_admin.
crates/fluss/tests/integration/log_table.rs	Update log table integration tests to remove .await from get_admin.
crates/fluss/tests/integration/kv_table.rs	Update KV table integration tests to remove .await from get_admin.
crates/fluss/tests/integration/admin.rs	Update admin integration tests to remove .await from get_admin.
crates/fluss/src/lib.rs	Update crate-level docs example to call get_admin() synchronously.
crates/fluss/src/client/table/scanner.rs	Update doc comments/examples to call get_admin() synchronously.
crates/fluss/src/client/connection.rs	Change get_admin to a synchronous cached accessor.
crates/fluss/README.md	Update README example to call get_admin() synchronously.
crates/examples/src/example_table.rs	Update Rust example to call get_admin() synchronously.
crates/examples/src/example_partitioned_kv_table.rs	Update Rust example to call get_admin() synchronously.
crates/examples/src/example_kv_table.rs	Update Rust example to call get_admin() synchronously.
bindings/python/test/test_sasl_auth.py	Update Python tests to call get_admin() synchronously.
bindings/python/test/conftest.py	Update fixtures/helpers to call get_admin() synchronously.
bindings/python/src/table.rs	Update binding code to use synchronous get_admin().
bindings/python/src/connection.rs	Change Python binding get_admin to a synchronous method returning FlussAdmin.
bindings/python/fluss/init.pyi	Update type stub to make get_admin synchronous.
bindings/python/example/example.py	Update Python example to call get_admin() synchronously.
bindings/cpp/src/lib.rs	Update C++ FFI wrapper to call synchronous get_admin().

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