Permit shared region as key or value for map

[Alan-Jowett]

Resolves: #620

This pull request introduces changes in the src/assertions.cpp, src/crab/ebpf_domain.cpp, test-data/call.yaml, and test-data/callx.yaml files. The changes mainly focus on modifying the handling of memory types in the codebase and updating the test cases accordingly.

Changes to memory handling:

• src/assertions.cpp: Modified the AssertExtractor class to change the type constraint of arg.reg from TypeGroup::stack_or_packet to TypeGroup::mem for PTR_TO_MAP_KEY and PTR_TO_MAP_VALUE cases.
• src/crab/ebpf_domain.cpp: Updated the ebpf_domain_t::operator() method to handle T_SHARED access register type. It now checks the access to shared memory and requires that the shared value is greater than 0.

Updates to test cases:

• test-data/call.yaml: Added new test cases for the bpf_map_update_elem function with different conditions for shared values. Also, updated the error messages in existing test cases to include shared as a valid type. [1] [2]
• test-data/callx.yaml: Updated the error message in a test case to include shared as a valid type.

[coveralls]

coverage: 90.358% (-0.02%) from 90.375% when pulling 959fc177edd0b5c619b3c0cb80d508b2f9ea23a4 on Alan-Jowett:issue620 into edf88e2bed6d281657a032dc38fa6e4983ab0478 on vbpf:main.