[beeswax] Add get_indexes API endpoint
GET beeswax/api/table/(?P<database>\w+)/(?P<table>\w+)/indexes
{
"status": 0,
"headers": ["idx_name", "tab_name", "col_names", "idx_tab_name", "idx_type", "comment"],
"error_message": "",
"rows": [
["web_logs_id_idx ", "web_logs ", "id ", "default__web_logs_web_logs_id_idx__", "compact ", ""],
["web_logs_client_ip_idx", "web_logs ", "client_ip ", "default__web_logs_web_logs_client_ip_idx__", "compact ", ""],
["web_logs_region_code_idx", "web_logs ", "client_ip ", "default__web_logs_web_logs_region_code_idx__", "compact ", ""]
]
}