Add -cname-chasing option

[aryanpatel3]

Summary: Add a -cname-chasing command-line argument to fbdns. This allows us to control whether CNAME chasing in enabled or not.

Differential Revision: D64804019

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This pull request was exported from Phabricator. Differential Revision: D64804019

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D64804019

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 51.21951% with 20 lines in your changes missing coverage. Please review.

Project coverage is 59.24%. Comparing base (86af19b) to head (9f33e7f).
Report is 18 commits behind head on main.

Files with missing lines	Patch %	Lines
dnsrocks/fbserver/cnamechasing.go	0.00%	7 Missing ⚠️
dnsrocks/fbserver/server.go	65.00%	6 Missing and 1 partial ⚠️
dnsrocks/dnsserver/handler.go	61.53%	4 Missing and 1 partial ⚠️
dnsrocks/cmd/dnsrocks/dnsrocks.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #85      +/-   ##
==========================================
- Coverage   59.47%   59.24%   -0.23%     
==========================================
  Files          90       91       +1     
  Lines        8690     8831     +141     
==========================================
+ Hits         5168     5232      +64     
- Misses       3204     3263      +59     
- Partials      318      336      +18     

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This pull request has been merged in d4d8634.