Add `Array.SetType()` to allow updating TypeInfo

[fxamacker]

Closes #372

This feature is needed by Cadence migrations to update static types. For more details, see

• https://github.com/onflow/cadence/issues/3096#issuecomment-1977580596.

This PR allows updating static types of Array container.

---

• [ ] Targeted PR against main branch
• [x] Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• [x] Code follows the standards mentioned here
• [x] Updated relevant documentation
• [x] Re-reviewed Files changed in the Github PR explorer
• [x] Added appropriate labels

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 69.23077% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 65.08%. Comparing base (86040b3) to head (431511d).

Files	Patch %	Lines
array.go	69.23%	3 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## feature/stable-cadence #374 +/- ## ========================================================== + Coverage 65.00% 65.08% +0.07% ========================================================== Files 14 14 Lines 8359 8372 +13 ========================================================== + Hits 5434 5449 +15 + Misses 2228 2227 -1 + Partials 697 696 -1 ```

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