Add opentelemetry_ignore_paths directive to the module

[sahilganguly]

Is your feature request related to a problem? Please describe

I would like to exclude certain paths from creating spans. These calls are made to nginx internally using the vts module, and do not have strict location blocks for these paths:

/{status_uri}/format/json
/{status_uri}/control?cmd=status&...

Describe the solution you'd like

Implement the opentelemetry_ignore_paths directive as supported by the upstream otel_ngx module

Describe alternatives you've considered

Because the calls mentioned above do not have strict location blocks, I cannot use the otel_trace off; option to suppress span creation.

Additional context

I'm happy to use other alternatives as suggested by the team if they exist.

[p-pautov]

In general, paths can be ignored via map as otel_trace supports variables, e.g.

http {
    map $uri $traceable {
        ~^/status off;
        default on;
    }

    otel_trace $traceable;

Also, what do you mean by "strict location blocks"? Can't you just put otel_trace off; to the same location as vhost_traffic_status_display;?