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Fix orthgonality loss in Davidson using Gram-Schmidt reorthogonalisation (#191)

* * Fix orthgonality loss in Davidson using Gram-Schmidt reorthogonalisation in
  case orthogonality loss is detected.

* * Differentiate between block size and number of guesses in Davidson
  procedure. In cases where n_guesses > n_states, this may lead to a decrease
  in the number of matrix applies needed till convergence.

* fix bug in call to estimate_n_guesses

* * Davidson block size as keyword argument 'n_block' and corresponding sanity
  checks.

* adapt tests to changed number of guesses

* move n_block sanity checks to eigsh

* only update entries for the last n_ss_added vectors in the projected matrix

* add more davidson tests

* more explicit n_block test

* add codecov token in CI

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Co-authored-by: jonasleitner <jonas.leitner1@gmx.de>

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