Make xmap eager for in memory data by default

[felixcremer]

This makes the xmap computation eager by default for in-memory data. This can be changed by setting the Xmap.LAZY_INMEMORY_XMAP constant.
We are using a const here instead of keyword arguments, because we also want to be able to change the behaviour for broadcasts where we can't have a keyword argument.

This closes #579

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.66%. Comparing base (113e035) to head (333a36e).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #583      +/-   ##
==========================================
+ Coverage   69.62%   69.66%   +0.04%     
==========================================
  Files          15       15              
  Lines        2199     2202       +3     
==========================================
+ Hits         1531     1534       +3     
  Misses        668      668              

Files with missing lines	Coverage Δ
src/DAT/xmap.jl	54.15% <100.00%> (+0.50%)	⬆️

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[felixcremer]

Bump