Fix inconsistent oracle primitives

[bastoica]

Fixing inconsistencies in the shared oracle primitives. This patch standardized the interfaces and adds validation so checks can be implemented consistently and the oracles don’t crash or produce misleading pass/fail results:

• oracles were inconsistent in using EntryConfig object and hardcoded some of the requirements;
• different requirements used different parameter naming conventions (e.g., cmd vs command) ;
• few initialization methods (i.e., __post_init__) tried to set attributes that didn’t exist;
• implemented time-bounded primitives