added usage_metrics to full output

[lorenzejay]

…esult

Feature Added for #162

Added onto the Crew Class which takes in output_token_usage

Adds to full_output and to the result

Usage

Crew(
    agents=[agent],
    tasks=[task1],
    process=Process.sequential,
    full_output=True,
    verbose=True,
    output_token_usage=True,
)

Output:

Howdy!
(-------)
TOKEN USAGE:
total_tokens=176
prompt_tokens=158
completion_tokens=18
successful_requests=1

and or like this when full_output = True
{'final_output': 'Hi!', 'tasks_outputs': [TaskOutput(description='just say hi!', summary='just say hi!...', exported_output='Hi!', agent='test role', raw_output='Hi!')], 'token_usage': {'total_tokens': 169, 'prompt_tokens': 152, 'completion_tokens': 17, 'successful_requests': 1}}

[lorenzejay]

After some reconsideration with having crew.usage_metrics it makes the most sense just to append this the full_output and close tickets related to showing tokens since usage_metrics solves it