Implement Header annotation

[Thevakumar-Luheerathan]

Purpose

Resolves #487

Goals

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Approach

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User stories

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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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Marketing

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Automation 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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Related PRs

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Learning

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[codecov]

Codecov Report

Merging #507 (6eab2db) into svc-impl (1d02613) will increase coverage by 4.20%.
The diff coverage is 77.46%.

@@              Coverage Diff               @@
##             svc-impl     #507      +/-   ##
==============================================
+ Coverage       53.37%   57.57%   +4.20%     
- Complexity        141      211      +70     
==============================================
  Files              35       39       +4     
  Lines            1008     1221     +213     
  Branches          117      153      +36     
==============================================
+ Hits              538      703     +165     
- Misses            410      439      +29     
- Partials           60       79      +19     

Impacted Files	Coverage Δ
.../java/org/ballerinax/azurefunctions/Constants.java	0.00% <ø> (ø)
...ons/validators/AzureFunctionsCodeAnalyzerTask.java	50.00% <50.00%> (ø)
...urefunctions/validators/HttpListenerValidator.java	77.92% <77.92%> (ø)
...ballerinax/azurefunctions/AzureCompilerPlugin.java	100.00% <100.00%> (ø)
...allerinax/azurefunctions/AzureDiagnosticCodes.java	100.00% <100.00%> (ø)
...nax/azurefunctions/AzureFunctionsCodeAnalyzer.java	100.00% <100.00%> (ø)
.../main/java/org/ballerinax/azurefunctions/Util.java	52.23% <100.00%> (+9.38%)	⬆️

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