* feat(storage): Add AllocTracker
* feat(storage): flush request wip
* feat(storage): support global write buffer size
* fix(storage): Test and fix size based strategy
* test(storage): Test AllocTracker
* test(storage): Test pick_by_write_buffer_full
* docs: Add flush config example
* test(storage): Test schedule_engine_flush
* feat(storage): Add metrics for write buffer size
* chore(flush): Add log when triggering flush by global buffer
* chore(storage): track allocation in update_stats
* feat: Add FlushPicker
* feat(storage): Add close to StorageEngine
* style(storage): fix clippy
* feat(storage): Close regions in StorageEngine::close
* chore(storage): Clear requests on scheduler stop
* test(storage): Test flush picker
* feat(storage): Add metrics for auto flush
* feat(storage): Add flush reason and record it in metrics
* feat: Expose flush config
docs(config): Update config example
* refactor(storage): Run auto flush task in FlushScheduler
* refactor(storage): Add FlushItem trait to make FlushPicker easy to test
* feat: implement load_options.
* refactor: build by ConfigOptions.
* refactor: init_global_logging by LoggingOptions.
* chore: make clippy happy.
* refactor: use TopLevelOptions push top level options to subcommand.
* test: test TopLevelOptions.
* refactor: push Options in Box.
* refactor: push Options in Box.
* refactor: use let-else and Options.
* feat: Remove create_mock_sql_handler()
create_to_request() and alter_to_request() don't need `&self`, so
we don't need to mock the sql handler to test them
* feat: Enable procedure manager by default
* docs: Update config example
* test: Enable procedure framework in all tests
* refactor(datanode): rename methods using procedure
* test(catalog): Fix temp dir drops before test finishes
* tests: Enable procedure framework in sqlness
* test: Fix sqlness standalone rename test
* fix: Drop procedure allows table not in engine
* test: Change rename table test
* fix: add options to table meta when creating table by procedure
* test: adjust error message in schema test case
* test: Fix test_sql_api error message
* docs: Add comments to standalone config example
* docs: Add comments to datanode config example
* docs: Add comments to frontend config example
* docs: Add comments to meta-srv config example
* docs: Use "GB" instead of "GiB"
* docs: Add link to the selector doc
* docs: Fix grammar
* refactor: options and sample configurations
* chore: newline at end of file
* chore: format code
* chore: remove comment and set sample configurations to default values
* chore: use single quoted string in sample configuration files
* refactor: dependency, from frontend depends on datanode to datanode depends on frontend
* wip: start frontend in datanode
* wip: migrate create database to frontend
* wip: impl alter table
* fix: CR comments
* feat: add table id and region ids field to CreateExpr
* chore: rebase develop
* refactor: frontend catalog should set from datanode
* feat: gRPC AddColumn request support add multi columns
* wip: move create table and create-on-insertion to frontend
* wip: error handling
* fix: some unit tests
* fix: all unit tests
* chore: merge develop
* feat: add create/alter-on-insertion to dist_insert/sql_dist_insert
* fix: add region number/catalog/schema to InsertExpr
* feat: add handle_create_table/handle_create_database...
* fix: remove catalog from insert expr
* fix: CR comments
* fix: when running in standalone mode, mysql opts and postgres opts should pass to frontend so that auctually running service can change the port to listen on
* refactor: add a standalone subcommand, move frontend start stuff to cmd package
* chore: optimize create table failure logs
* docs: change readme
* docs: update readme
