Migrate to new compiler extension

[xlight05]

Purpose

1. Extension now generates resource functions per each az function instead of storing handler functions in a map.
2. Removes old Compiler Plugin implementation and migrates to new compiler extension model
3. Cleans and refactor gradle scripts

Resolves #200
Resolves #201

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

• Unit tests

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• 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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Related PRs

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Migrations (if applicable)

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Test environment

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Learning

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[codecov]

Codecov Report

Merging #191 (74c7954) into new-extension (88bf5a7) will decrease coverage by 0.98%.
The diff coverage is 91.30%.

@@                 Coverage Diff                 @@
##             new-extension     #191      +/-   ##
===================================================
- Coverage            79.56%   78.58%   -0.99%     
- Complexity             217      232      +15     
===================================================
  Files                   32       37       +5     
  Lines                 1204     1396     +192     
  Branches               125      138      +13     
===================================================
+ Hits                   958     1097     +139     
- Misses                 156      202      +46     
- Partials                90       97       +7     

Impacted Files	Coverage Δ
.../java/org/ballerinax/azurefunctions/Constants.java	0.00% <ø> (ø)
...lerinax/azurefunctions/AzureCodeGeneratedTask.java	69.56% <69.56%> (ø)
...rg/ballerinax/azurefunctions/AzureCodegenTask.java	89.18% <89.18%> (ø)
...ain/java/org/ballerinax/azurefunctions/STUtil.java	76.99% <93.15%> (-4.29%)	⬇️
.../ballerinax/azurefunctions/AzureCodeGenerator.java	100.00% <100.00%> (ø)
...ballerinax/azurefunctions/AzureCompilerPlugin.java	100.00% <100.00%> (ø)
...lerinax/azurefunctions/AzureFunctionExtractor.java	100.00% <100.00%> (ø)
...ballerinax/azurefunctions/AzureFunctionHolder.java	100.00% <100.00%> (ø)
...allerinax/azurefunctions/AzureFunctionVisitor.java	73.68% <100.00%> (+1.46%)	⬆️
...lerinax/azurefunctions/AzureLifecycleListener.java	100.00% <100.00%> (ø)
... and 8 more

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