feat: Return socket from createConnection and add type for createConnection

[nabeelbukhari]

As per http.agent createConnection method, the method should return a socket but I found that current implemenation of createConnection for Agent doesn't return socket.

Checklist

• npm test passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

N/A

Description of change

Return socket from createConnection and add type for createConnection

[nabeelbukhari]

@fengmk2 Can you please help review this PR?

[codecov]

Codecov Report

Merging #113 (ee82816) into master (2092714) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #113   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         4           
  Lines          223       224    +1     
  Branches        43        43           
=========================================
+ Hits           223       224    +1     

Files Changed	Coverage Δ
lib/agent.js	100.00% <100.00%> (ø)
lib/https_agent.js	100.00% <100.00%> (ø)

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[fengmk2]

4.4.0

[fengmk2]

@nabeelbukhari Thanks!