feat(init-generator): add svelte template

[jamesgeorge007]

What kind of change does this PR introduce? feature

Did you add tests for your changes? Yes

If relevant, did you update the documentation? N/A

Summary This PR aims at adding a svelte template for init-generator #2832

Does this PR introduce a breaking change? No

Other information N/A

[codecov[bot]]

Codecov Report

Merging #2859 (22ee992) into master (d9d4c37) will decrease coverage by 0.29%. The diff coverage is 73.91%.

@@            Coverage Diff             @@
##           master    #2859      +/-   ##
==========================================
- Coverage   95.01%   94.71%   -0.30%     
==========================================
  Files          31       32       +1     
  Lines        1706     1723      +17     
  Branches      498      497       -1     
==========================================
+ Hits         1621     1632      +11     
- Misses         85       91       +6     

Impacted Files	Coverage Δ
packages/generators/src/utils/helpers.ts	74.07% <42.85%> (-10.93%)	:arrow_down:
packages/generators/src/handlers/svelte.ts	85.71% <85.71%> (ø)
packages/generators/src/addon-generator.ts	91.83% <100.00%> (-0.76%)	:arrow_down:
packages/generators/src/handlers.ts	100.00% <100.00%> (ø)

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