Allow passing of block identifiers (e.g., "pending") to interface functions.

[slundqui]

Additionally allows interface.get_hyperdrive_state() to get a block_identifier instead of the block data. Still allows passing in of an explicit block_data parameter if the caller has this information.

[codecov]

Codecov Report

Attention: Patch coverage is 94.11765% with 3 lines in your changes missing coverage. Please review.

Project coverage is 81.41%. Comparing base (9ccfd4d) to head (5caf18e).

Files	Patch %	Lines
...gent0/ethpy/hyperdrive/interface/read_interface.py	92.10%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1602      +/-   ##
==========================================
+ Coverage   81.14%   81.41%   +0.27%     
==========================================
  Files          98       98              
  Lines        7275     7276       +1     
==========================================
+ Hits         5903     5924      +21     
+ Misses       1372     1352      -20     

Flag	Coverage Δ
unittests	81.41% <94.11%> (+0.27%)	⬆️

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