Feature/add alignment cache

[rrahn]

Adds little helper class for the alignment cache instead of using a tuple which is hard to read since we can't use expressive namings for the variables.

NOTE: Only the last commit is relevant.

[codecov]

Codecov Report

Merging #1243 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1243   +/-   ##
=======================================
  Coverage   97.36%   97.36%           
=======================================
  Files         221      221           
  Lines        8912     8912           
=======================================
  Hits         8677     8677           
  Misses        235      235

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[svnbgnk]

The expressive names could be used in the unit test here: https://github.com/seqan/seqan3/blob/5913290cf1b38e9e488a42a571d5a6c48873641b/test/unit/alignment/pairwise/policy/affine_gap_banded_init_policy_test.cpp#L98-99.

Where/How is make_cache() defined?

[smehringer]

It is weird to merge something without a use case but I guess you will refactor this later on.

[rrahn]

It is weird to merge something without a use case but I guess you will refactor this later on.

Well, no one want's to review a >2k LOC change either so at some level I have to make a compromise 🤷‍♂

[rrahn]

The expressive names could be used in the unit test here: https://github.com/seqan/seqan3/blob/5913290cf1b38e9e488a42a571d5a6c48873641b/test/unit/alignment/pairwise/policy/affine_gap_banded_init_policy_test.cpp#L98-99.

A lot of these parts will be removed when I am done with the whole refactoring.