Refactor TraceCallExecutor unit tests

[canepat]

Unit tests for TraceCallExecutor should be refactored to improve readability and semantics:

• add constructor in EVMExecutor with silkworm::State as input parameter instead of core::rawdb::DatabaseReader
• add constructor in TraceCallExecutor with silkworm::State and EVMExecutor as input parameters instead of core::rawdb::DatabaseReader or change TraceCallExecutor::execute
• if possible, refactor EVMExecutor and TraceCallExecutor to avoid templates
• mock silkworm::State using Gmock
• refactor unit tests
• rename TraceCallExecutor as TraceExecutor