implement replace-at

[pavitthrap]

Description

This PR implements replace-at. The function takes in a sequence, an index, and an element, and returns a new sequence in which the element is substituted in at the provided index.

Applicable issues

• fixes #3284

Additional info (benefits, drawbacks, caveats)

The name was modified due to discussion in the issue.

[codecov[bot]]

Codecov Report

Merging #3296 (1b19aa0) into next (48dc9c9) will decrease coverage by 0.34%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             next    #3296      +/-   ##
==========================================
- Coverage   29.69%   29.35%   -0.35%     
==========================================
  Files         279      278       -1     
  Lines      229610   229613       +3     
==========================================
- Hits        68191    67400     -791     
- Misses     161419   162213     +794     

Impacted Files	Coverage Δ
clarity/src/vm/analysis/arithmetic_checker/mod.rs	74.45% <ø> (ø)
...larity/src/vm/analysis/arithmetic_checker/tests.rs	0.00% <0.00%> (ø)
clarity/src/vm/analysis/read_only_checker/mod.rs	76.85% <ø> (ø)
clarity/src/vm/analysis/read_only_checker/tests.rs	0.00% <0.00%> (ø)
...larity/src/vm/analysis/type_checker/natives/mod.rs	56.07% <0.00%> (-0.10%)	:arrow_down:
.../src/vm/analysis/type_checker/natives/sequences.rs	59.16% <0.00%> (-3.39%)	:arrow_down:
clarity/src/vm/analysis/type_checker/tests/mod.rs	0.00% <0.00%> (ø)
clarity/src/vm/docs/mod.rs	0.00% <0.00%> (ø)
clarity/src/vm/functions/mod.rs	65.21% <0.00%> (-0.14%)	:arrow_down:
clarity/src/vm/functions/sequences.rs	49.58% <0.00%> (-5.77%)	:arrow_down:
... and 31 more

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[gregorycoppola]

I removed myself from reviewing this PR because @jcnelson is the second reviewer and @kantai has approved.

[a3slade]

The unit tests are breaking because the cost function wasn't implemented. I think this is supposed to go in costs-3.clar?