feat: onboard smartly destination

[aanshi07]

What are the changes introduced in this PR?

Onboarded new destination - Smartly

What is the related Linear task?

Resolves INT-1515

Smartly Doc for reference : https://support.smartly.io/hc/en-us/articles/4406049685788-S2S-integration-API-description#01H8HBXZF6WSKSYBW1C6NY8A88

Please explain the objectives of your changes below

Put down any required details on the broader aspect of your changes. If there are any dependent changes, mandatorily mention them here

Any changes to existing capabilities/behaviour, mention the reason & what are the changes ?

N/A

Any new dependencies introduced with this change?

N/A

Any new generic utility introduced or modified. Please explain the changes.

N/A

Any technical or performance related pointers to consider with the change?

N/A

@coderabbitai review

---

Developer checklist

• My code follows the style guidelines of this project

• No breaking changes are being introduced.

• All related docs linked with the PR?

• All changes manually tested?

• Any documentation changes needed with this change?

• Is the PR limited to 10 file changes?

• Is the PR limited to one linear task?

• Are relevant unit and component test-cases added in new readability format?

Reviewer checklist

• Is the type of change in the PR title appropriate as per the changes?

• Verified that there are no credentials or confidential data exposed with the changes.

[devops-github-rudderstack]

Test report for this run is available at: https://test-integrations-dev.s3.amazonaws.com/integrations-test-reports/rudder-transformer/3660/test-report.html

[codecov]

Codecov Report

Attention: Patch coverage is 96.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 88.60%. Comparing base (6b1a23a) to head (a0cd469).
Report is 1 commits behind head on release/v1.76.0.

Files	Patch %	Lines
src/cdk/v2/destinations/smartly/utils.js	95.45%	2 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##           release/v1.76.0    #3660      +/-   ##
===================================================
+ Coverage            88.59%   88.60%   +0.01%     
===================================================
  Files                  589      591       +2     
  Lines                32051    32101      +50     
  Branches              7631     7640       +9     
===================================================
+ Hits                 28395    28443      +48     
- Misses                3333     3365      +32     
+ Partials               323      293      -30     

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[shrouti1507]

didn't we discuss to support event mapping in UI, and following code handling in transformer? Where is that part of code

[anantjain45823]

@CodeRabbit review

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
92.4% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud