Add nan and inf matrix helpers

Jordan Schneiderrequested to merge
jschneidz/eigen:add-nan-and-inf-matrix-helpers into master

Description

  • Add analogous helper methods for NaN and Inf matrices as the current Ones and Zeroes methods
  • Extends the miscmatrices test file to include tests for these new helpers

Reference issue

Issue #586

Additional information

First time contributor, any feedback is appreciated and apologies for anything missed

Edited by Jordan Schneider

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