Add an option to not copy columns when constructing a TSFrame

[asinghvi17]

Needs tests. Basically, this allows us to construct a TSFrame with negligible overhead.

It's based off asinghvi17:issorted, so once that's merged I'll rebase this.

[asinghvi17]

Huh! It looks like something changed the sort order for the columns. Ideally we should be using isempty(setdiff(...)) instead of equality here anyway, what do you think @chiraganand?

[chiraganand]

Huh! It looks like something changed the sort order for the columns. Ideally we should be using isempty(setdiff(...)) instead of equality here anyway, what do you think @chiraganand?

This shouldn't be a problem.

PS: Avoid force-pushing because it breaks code coverage and creates problems while merging the branch into main, though it can be done easily by squashing but that loses commit history from the branch.

[codecov-commenter]

Codecov Report

Merging #142 (0f434a5) into main (dd702ea) will decrease coverage by 0.02%. The diff coverage is 96.87%.

@@            Coverage Diff             @@
##             main     #142      +/-   ##
==========================================
- Coverage   91.41%   91.39%   -0.02%     
==========================================
  Files          20       20              
  Lines         431      430       -1     
==========================================
- Hits          394      393       -1     
  Misses         37       37              

Impacted Files	Coverage Δ
src/TSFrame.jl	97.95% <96.87%> (ø)
src/utils.jl	86.36% <0.00%> (-0.21%)	:arrow_down:

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[asinghvi17]

bump @chiraganand - I think this should be mergeable now.