Codec2: Finalize C2Component APIs and add C2ComponentFactory

- rename getXYZ methods that are not strictly getters
- add override to all virtual overrides
- rename integral C2 types to lower case with _t suffix
  (e.g. c2_status_t and c2_node_id_t)
- rename C2ComponentInfo and C2Allocator::Info to Traits
- add missing configuration API members to C2ComponentStore
- add _nb/_sm markers to work and configuration methods
- replace flags for drain/flush with enums
- add C2Component::setListener_sm
- use C2ComponentFactory to create component in codec2 cmd

Bug: 64121714
Test: unittest
Change-Id: I98ce71a9de23c7ff5ed7abc4d48822d0bfa6a29e