Followup #28890
Make HttpSqlConverterPlugin and AuditLoader as Doris' builtin plugin.
To make it simple for user to support sql dialect and using audit loader.
HttpSqlConverterPlugin
By default, there is nothing changed.
There is a new global variable sql_converter_service, default is empty, if set, the HttpSqlConverterPlugin will be enabled
set global sql_converter_service = "http://127.0.0.1:5001/api/v1/convert"
AuditLoader
By default, there is nothing changed.
There is a new global variable enable_audit_plugin, default is false, if set to true, the audit loader plugin will be enable.
Doris will create audit_log in __internal_schema when startup
If enable_audit_plugin is true, the audit load will be inserted into audit_log table.
3 other global variables related to this plugin:
audit_plugin_max_batch_interval_sec: The max interval for audit loader to insert a batch of audit log.
audit_plugin_max_batch_bytes: The max batch size for audit loader to insert a batch of audit log.
audit_plugin_max_sql_length: The max length of statement in audit log
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