Implement additional flags

[AntoniosBarotsis]

Requirements

• $ ambi_mock_client -s 5
  send 1 number of fake sensor readings every 5 seconds
• $ ambi_mock_client -t 5
  send a total of 5 sensor requests over the span of 50 seconds
• $ ambi_mock_client -s 5 -t 3
  Send 3 sensor requests at an interval of 1 every 5 seconds
• $ ambi_mock_client -i 12
  send 12 concurrent sensor requests at a time

[AntoniosBarotsis]

I'll write the commands used to run each of the bullet point examples mentioned in the issue. These are subject to change (especially the flag names), I'm just grouping them here for ease of development

• --time-per-request-s 5 --loop-indefinitely (?)
• --request-amount 5 --total-time-s 50
• --request-amount 3 --time-per-request-s 5 (?)
• --num-threads 12

Outdated

[AntoniosBarotsis]

Note to self: Discuss default values for all the parameters. I currently have the following

const DEFAULT_REQUEST_AMOUNT: u32 = 1;
const DEFAULT_TIME_PER_REQUEST: Duration = Duration::from_secs(10);
const DEFAULT_NUM_THREADS: u32 = 1;
const MAX_NUM_THREADS: u32 = 10;

I think that the request amount as well as the thread stuff are fine, maybe the time per request is a bit too much. Not sure if 1s or 5s would make more sense.