feat: Use sparse matrix algebra

[albersonmiranda]

Use sparse matrix algebra when involving identity matrix arithmatics (I-A; A / x). Expected increase in performance as showed in #41.

• Check sparsity ratio for EXIOBASE data
• Decide for using sparse matrix and when

[albersonmiranda]

Is there use cases with 2/3 sparsity ratio to justify sparse algebra?

[albersonmiranda]

Is there use cases with 2/3 sparsity ratio to justify sparse algebra?

Yes, Exiobase 2022 has 68% of zeros entries. {fio} should use sparse matrix algebra when:

1. It detects matrix is large enough length(obj) > 1e6
2. Matrix is sparse (sum(obj == 0) / sum(obj != 0) > 0.66

But only makes sense working on it after #47 , since such matrix sizes appears on multi-region IOTs.