[agw] Replace hashtable OAI lib to a standard library through map.h interface

[ardzoht]

Description

• OAI makes use of its own internal library for hashtable structures. This is a wide-used library being used throughout all MME tasks mostly for the maintenance of both task’s and UE state. There are multiple types available to use, but mostly both uint64 => uint64 and uint64 => object PTR thread-safe mappings are the most used in the codebase.
• This library has shown evidence of being prone to instability across compiler versions, due to its complex memory management with value and key pointer objects: e.g. fix(mme): Fix to pass test_ngap_state_converter in Bazel testing #11865

Goal

• We want to iteratively migrate OAI’s hashtable and their usage to protobuf's generated object CPP hashmap structs, a starting point to refer can be: /lte/gateway/c/core/oai/tasks/mme_app/mme_app_ip_imsi.cpp or lte/gateway/c/core/oai/include/map.h

1. Replace hashtable lib usages in S1AP, NGAP task procedures to magma::map_s
2. Replace hashtable lib usages in SPGW task procedures to magma::map_s
3. Replace hashtable lib usages in MME APP task procedures to magma::map_s
4. Replace hashtable lib usages in SGW_S8 task procedures to magma::map_s

[ssanadhya]

@rsarwad , is there any hash table managed by the SGW_S8 task? If yes, please add that to the list of goals for this issue.

[rsarwad]

Yes @ssanadhya, SGW_S8 task also includes hash tables. The estimation includes sgw_s8 task

[stale]

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