Update Library API to Include Status

[Swiftyos]

So tis something like this:

class LibraryAgentResponse:
    agents: List[LibraryAgent]
    pagination: Pagination # info


class LibraryAgent(BaseModel):
    agent_id: str
    agent_version: int
    name: str
    image_url: str
    creator_name: str
    creator_image_url: str
    short_description: str
    status: AgentStatus
    new_output: bool
    can_access_graph: bool
    input_schema: ...
    preset_id: str | None
    preset_input_data: ... | None
    
class AgentStatus(enum):
    HEALTHY
    ERROR
    WAITING
    COMPLETED


As for the runs we can use a slightly modified GraphExecution:

# Reuse GraphExecution, with cost added to it.
class GraphExecution(BaseDbModel):
    execution_id: str
    started_at: datetime
    ended_at: datetime
    duration: float
    total_run_time: float
    status: ExecutionStatus
    graph_id: str
    graph_version: int
+++ preset_id: str | None # needed to be able to link runs to a specific preset
+++ cost: int