Add BroadcastStyle support for Bidiagonal

[DanielVandH]

Tests rely on JuliaArrays/LazyArrays.jl#391 (specifically, JuliaArrays/LazyArrays.jl@b34b2f6)

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (33fdfc4) to head (8d2a686).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
src/bidiag.jl	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (33fdfc4) and HEAD (8d2a686). Click for more details.

HEAD has 5 uploads less than BASE

Flag	BASE (33fdfc4)	HEAD (8d2a686)
	8	3

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #153       +/-   ##
==========================================
- Coverage   84.17%   0.00%   -84.18%     
==========================================
  Files           7       7               
  Lines        1321    1311       -10     
==========================================
- Hits         1112       0     -1112     
- Misses        209    1311     +1102     

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[dlfivefifty]

Make sure you set the minimum versions to the new branches