feat(config): config option to keep tcp connection alive for a certain period for subsequent requests (#548)

* Added new HTTP connection setting to the reqwest::ClientBuilder to timeout requests for fetching the search results from the upstream search engines.

* Provided a config option under the server section of the config to allow users to keep tcp connections alive for each request for a certain period of time

* Update src/results/aggregator.rs

Co-authored-by: neon_arch <mustafadhuleb53@gmail.com>

* Update src/results/aggregator.rs

Co-authored-by: neon_arch <mustafadhuleb53@gmail.com>

* Fixed import issue in `tcp_connection_keepalive`

* updated size to u8

Co-authored-by: neon_arch <mustafadhuleb53@gmail.com>

* Fixed sizer eror in `parser.rs`

---------

Co-authored-by: neon_arch <mustafadhuleb53@gmail.com>
Co-authored-by: alamin655 <129589283+alamin655@users.noreply.github.com>
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@ -10,6 +10,7 @@ production_use = false -- whether to use production mode or not (in other words
-- if production_use is set to true
-- There will be a random delay before sending the request to the search engines, this is to prevent DDoSing the upstream search engines from a large number of simultaneous requests.
request_timeout = 30 -- timeout for the search requests sent to the upstream search engines to be fetched (value in seconds).
tcp_connection_keepalive = 30 -- the amount of time the tcp connection should remain alive (or connected to the server). (value in seconds).
rate_limiter = {
number_of_requests = 20, -- The number of request that are allowed within a provided time limit.
time_limit = 3, -- The time limit in which the quantity of requests that should be accepted.