[athena-poc] change principal address calculation

[poszu]

Changed how the principal address is calculated to follow https://community.spacemesh.io/t/proposed-athena-design/433#type-1-self-spawn-4. Previously, it used a types.GenerateAddress() which reserves 4B (puts zeros there).

[codecov]

❌ 27 Tests Failed:

Tests completed	Failed	Passed	Skipped
12077	27	12050	10

View the top 3 failed tests by shortest run time

github.com/spacemeshos/go-spacemesh/api/grpcserver TestMeshService/AccountMeshDataQuery/filter_with_valid_AccountId_and_AccountMeshDataFlags_tx_only

Stack Traces | 0s run time

=== RUN   TestMeshService/AccountMeshDataQuery/filter_with_valid_AccountId_and_AccountMeshDataFlags_tx_only
    grpcserver_test.go:915: 
        	Error Trace:	.../api/grpcserver/grpcserver_test.go:915
        	Error:      	Received unexpected error:
        	            	rpc error: code = Unknown desc = failed to parse Filter.AccountId.Address `sm1ezehmmgamhyjtm0qn2cckdv5rgj83g6jsuh3fdsakl0xz`: expected first 4 bytes to be 0, got 200: missing reserved space
        	Test:       	TestMeshService/AccountMeshDataQuery/filter_with_valid_AccountId_and_AccountMeshDataFlags_tx_only
--- FAIL: TestMeshService/AccountMeshDataQuery/filter_with_valid_AccountId_and_AccountMeshDataFlags_tx_only (0.00s)

github.com/spacemeshos/go-spacemesh/api/grpcserver TestMeshService/AccountMeshDataQuery/max_results_page_2

Stack Traces | 0s run time

=== RUN   TestMeshService/AccountMeshDataQuery/max_results_page_2
    grpcserver_test.go:986: 
        	Error Trace:	.../api/grpcserver/grpcserver_test.go:986
        	Error:      	Received unexpected error:
        	            	rpc error: code = Unknown desc = failed to parse Filter.AccountId.Address `sm1ezehmmgamhyjtm0qn2cckdv5rgj83g6jsuh3fdsakl0xz`: expected first 4 bytes to be 0, got 200: missing reserved space
        	Test:       	TestMeshService/AccountMeshDataQuery/max_results_page_2
--- FAIL: TestMeshService/AccountMeshDataQuery/max_results_page_2 (0.00s)

github.com/spacemeshos/go-spacemesh/api/grpcserver TestSmesherService

Stack Traces | 0s run time

=== RUN   TestSmesherService
--- FAIL: TestSmesherService (0.00s)

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