More compact show for block sparse arrays

[mtfishman]

With this PR printing block sparse arrays looks like:

julia> a1 = BlockSparseArray{Float64}([2, 2])
2-blocked 4-element BlockSparseVector{Float64, Vector{Float64}, …}:
 .
 .
 ─
 .
 .

julia> a2 = BlockSparseArray{Float64}([2, 2], [2, 2])
2×2-blocked 4×4 BlockSparseMatrix{Float64, Matrix{Float64}, …}:
 .  .  │  .  .
 .  .  │  .  .
 ──────┼──────
 .  .  │  .  .
 .  .  │  .  .

julia> a2'
4×4 adjoint(::BlockSparseMatrix{Float64, Matrix{Float64}, …}) with eltype Float64 with indices BlockedOneTo([2, 4])×BlockedOneTo([2, 4]):
 .  .  │  .  .
 .  .  │  .  .
 ──────┼──────
 .  .  │  .  .
 .  .  │  .  .

julia> a3 = BlockSparseArray{Float64}([2, 2], [2, 2], [2, 2])
2×2×2-blocked 4×4×4 BlockSparseArray{Float64, 3, Array{Float64, 3}, …}:
[:, :, 1] =
 .  .  .  .
 .  .  .  .
 .  .  .  .
 .  .  .  .

[:, :, 2] =
 .  .  .  .
 .  .  .  .
 .  .  .  .
 .  .  .  .

[:, :, 3] =
 .  .  .  .
 .  .  .  .
 .  .  .  .
 .  .  .  .

[:, :, 4] =
 .  .  .  .
 .  .  .  .
 .  .  .  .
 .  .  .  .

julia> PermutedDimsArray(a3, (3, 2, 1))
4×4×4 PermutedDimsArray(::BlockSparseArray{Float64, 3, Array{Float64, 3}, …}, (3, 2, 1)) with eltype Float64 with indices BlockedOneTo([2, 4])×BlockedOneTo([2, 4])×BlockedOneTo([2, 4]):
[:, :, 1] =
 .  .  .  .
 .  .  .  .
 .  .  .  .
 .  .  .  .

[:, :, 2] =
 .  .  .  .
 .  .  .  .
 .  .  .  .
 .  .  .  .

[:, :, 3] =
 .  .  .  .
 .  .  .  .
 .  .  .  .
 .  .  .  .

[:, :, 4] =
 .  .  .  .
 .  .  .  .
 .  .  .  .
 .  .  .  .

i.e. it suppresses printing the types of the block storage and axes (where it shows BlockSparseMatrix{Float64, Matrix{Float64}, …} rather than the contents of …), which can get very long, particularly for graded unit ranges.

Todo:

• Add tests for Base.show, Base.summary, and TypeParameterAccessors.position.

[codecov]

Codecov Report

Attention: Patch coverage is 88.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 74.90%. Comparing base (2f14c41) to head (75342a2).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...stractblocksparsearray/abstractblocksparsearray.jl	76.92%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
+ Coverage   74.31%   74.90%   +0.59%     
==========================================
  Files          30       30              
  Lines        1059     1108      +49     
==========================================
+ Hits          787      830      +43     
- Misses        272      278       +6     

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