feat: add functionality to operate radixtree. #156
+267
−21
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This commit adds some methods to operate radixtree. These methods allows Apache APISIX's radixtree_host_uri router to perform more efficient route updates via the Admin API.
sub_router - another radixtree instance attached to route.
get_sub_router () - provides direct access to a sub-router for subsequent operations (add/update/delete routes) without rebuilding the entire tree.
isempty() - checks whether radixtree contains any routes
Refer to (apache/apisix#12826)