curl timeout when logging to Grafana Cloud

Problem/Motivation

When attempting to log to the Grafana Cloud (grafana.net) the connection runs in a very tight timeout:

"Curl error (code 28): Resolving timed out after 100 milliseconds"

Proposed resolution

Allow curl_options to be set in services yaml by using curl constants - not only their integer representations - to loosen the tight timeouts defined in https://github.com/itspire/monolog-loki/blob/master/src/main/php/Handler...

In this case following options are required:

define('CURLOPT_CONNECTTIMEOUT_MS', 156);
define('CURLOPT_TIMEOUT_MS', 155);

But when I think further about this situation, having a slow logging handler (because of network latency) will cause a
noticeable negativ impact on response times of the Drupal site. Hence using something like the BufferHandler of monolog
would possibly become a requirement too.

Remaining tasks

TBD

User interface changes

TBD

API changes

None - I guess

Data model changes

None