Explicit memory management of working memory

[termoshtt]

Resolve #168

Changes

• Create structs which manages working memory used in LAPACK routines, e.g. EighWork
• Lapack trait merges *_ traits, e.g. Eigh_
• Introduce LapackStrict trait for APIs which manage memory strictly.
• ~~Make submodules in lax, e.g. lax::eigh, private and expose them into lax:: namespace~~ #242

TODO

• [x] cholesky
• [ ] eig
• [x] eigh
• [ ] least_square
• [ ] opnorm
• [ ] qr
• [ ] solve
• [ ] solveh
• [ ] svd
• [ ] svddc
• [ ] triangular
• [ ] tridiagonal

[codecov[bot]]

Codecov Report

Merging #241 into master will decrease coverage by 0.70%. The diff coverage is 69.69%.

@@            Coverage Diff             @@
##           master     #241      +/-   ##
==========================================
- Coverage   89.08%   88.38%   -0.71%     
==========================================
  Files          71       74       +3     
  Lines        3592     3694     +102     
==========================================
+ Hits         3200     3265      +65     
- Misses        392      429      +37     

Impacted Files	Coverage Δ
lax/src/cholesky.rs	100.00% <ø> (ø)
lax/src/lib.rs	100.00% <ø> (ø)
lax/src/strict.rs	0.00% <0.00%> (ø)
lax/src/eigh_generalized.rs	47.94% <47.94%> (ø)
lax/src/eigh.rs	100.00% <100.00%> (+5.55%)	:arrow_up:
lax/src/traits.rs	100.00% <100.00%> (ø)

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[termoshtt]

Lapack trait merges *_ traits, e.g. Eigh_ Introduce LapackStrict trait for APIs which manage memory strictly.

These should be split into another PR

[termoshtt]

This can be done without breaking change. I drop this PR from 0.13.0 milestone.

[termoshtt]

This PR is outdated. Passed to #333