feat: add benchmark dns option to spam subcommand

[gruberb]

Description

When operating topos nodes in a Kubernetes environment, we have to address each service through a Kubernetes abstraction, called a pod. These pods are networked via DNS. When testing the network via topos regtest spam our fixed IP_ADDRESS:PORT approach of talking to each node doesn't work. We therefore add new flags to the command:

topos regtest spam --benchmark --dns "http://validator-{N}:1340" --number 10

Fixes TP-852

PR Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added or updated tests that comprehensively prove my change is effective or that my feature works

[codecov]

Codecov Report

Attention: 16 lines in your changes are missing coverage. Please review.

Comparison is base (23cc558) 67.34% compared to head (4b7a277) 69.62%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
crates/topos-certificate-spammer/src/lib.rs	55.00%	9 Missing ⚠️
crates/topos-telemetry/src/tracing.rs	40.00%	3 Missing ⚠️
crates/topos-telemetry/src/lib.rs	0.00%	2 Missing ⚠️
crates/topos-certificate-spammer/src/config.rs	0.00%	1 Missing ⚠️
...ates/topos/src/components/regtest/commands/spam.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #448      +/-   ##
==========================================
+ Coverage   67.34%   69.62%   +2.27%     
==========================================
  Files         223      223              
  Lines       12271    12331      +60     
==========================================
+ Hits         8264     8585     +321     
+ Misses       4007     3746     -261     

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[Freyskeyd]

little comments but not blocking