Add code coverage for ballerina tests

[Thevakumar-Luheerathan]

Purpose

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resolves #520

Goals

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Release note

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Documentation

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Training

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Certification

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Automation tests

• Unit tests

  Code coverage information

• Integration tests

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Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines? yes/no
• Ran FindSecurityBugs plugin and verified report? yes/no
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes/no

Samples

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[codecov]

Codecov Report

Base: 66.32% // Head: 57.79% // Decreases project coverage by -8.52% ⚠️

Coverage data is based on head (02a740e) compared to base (4802947).
Patch has no changes to coverable lines.

Additional details and impacted files

@@              Coverage Diff               @@
##             svc-impl     #525      +/-   ##
==============================================
- Coverage       66.32%   57.79%   -8.53%     
- Complexity        238      433     +195     
==============================================
  Files              43       74      +31     
  Lines            1256     2360    +1104     
  Branches          153      582     +429     
==============================================
+ Hits              833     1364     +531     
- Misses            335      840     +505     
- Partials           88      156      +68     

Impacted Files	Coverage Δ
...lib/azure/functions/builder/XmlPayloadBuilder.java	55.55% <0.00%> (ø)
...functions/exceptions/PayloadNotFoundException.java	100.00% <0.00%> (ø)
...ballerina/stdlib/azure/functions/ParamHandler.java	54.83% <0.00%> (ø)
.../ballerina/stdlib/azure/functions/ModuleUtils.java	100.00% <0.00%> (ø)
...zure/functions/exceptions/BadRequestException.java	100.00% <0.00%> (ø)
...dlib/azure/functions/NativeHttpToAzureAdaptor.java	79.06% <0.00%> (ø)
.../functions/exceptions/HeaderNotFoundException.java	100.00% <0.00%> (ø)
...erina/stdlib/azure/functions/PayloadParameter.java	100.00% <0.00%> (ø)
...ballerina/stdlib/azure/functions/AZFParameter.java	71.42% <0.00%> (ø)
...unctions/exceptions/FunctionNotFoundException.java	0.00% <0.00%> (ø)
... and 21 more

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