Make PING timeout configurable

[nmeum]

🚀 Changes proposed by this PR

This commit allows configuring the interval at which girc will drop the connection after not receiving a PONG response to an outstanding PING. Presently, this is hardcoded to PINGDelay + 60s and can thus not be configured.

🧰 Type of change

• [ ] Bug fix (non-breaking change which fixes an issue).
• [x] New feature (non-breaking change which adds functionality).
• [ ] Breaking change (fix or feature that causes existing functionality to not work as expected).
• [ ] This change requires (or is) a documentation update.

📝 Notes to reviewer

If my understanding of the code base is correct then PINGTimeout must always be larger then PINGDelay. This is currently only mentioned in the documentation comment but not otherwise enforced. If this is deemed important then I see two potential solutions: (1) Emit an error if this invariant is not satisfied (2) Define PINGTimeout as an offset on PINGDelay.

🤝 Requirements

• [x] ✍ I have read and agree to this projects Code of Conduct.
• [x] ✍ I have read and agree to this projects Contribution Guidelines.
• [x] ✍ I have read and agree to the Developer Certificate of Origin.
• [x] 🔎 I have performed a self-review of my own changes.
• [x] 🎨 My changes follow the style guidelines of this project.
• [x] 💬 My changes as properly commented, primarily for hard-to-understand areas.
• [x] 📝 I have made corresponding changes to the documentation.
• [x] 🧪 I have included tests (if necessary) for this change.

[codecov-commenter]

Codecov Report

Merging #57 (2c1c277) into master (8240917) will increase coverage by 0.05%. The diff coverage is 60.00%.

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@@            Coverage Diff             @@
##           master      #57      +/-   ##
==========================================
+ Coverage   55.39%   55.45%   +0.05%     
==========================================
  Files          13       13              
  Lines        3264     3266       +2     
==========================================
+ Hits         1808     1811       +3     
+ Misses       1343     1342       -1     
  Partials      113      113              

Impacted Files	Coverage Δ
conn.go	53.80% <0.00%> (+0.14%)	:arrow_up:
client.go	63.18% <100.00%> (+0.29%)	:arrow_up:

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[nmeum]

Thanks for your quick feedback. I hope I have made appropriate changes to accommodate it.