Refactor ktransducer

[faridyagubbayli]

Towards #436

Moved active_elements, transmit_apodization, receive_apodization and related methods to the kWaveTransducerSimple while ensuring backwards compatibility. This is part of the effort to refactor the ktransducer.py.

[faridyagubbayli]

@waltsims @djps can you have a look and comment on the direction? If the direction looks good, I'll go ahead and update the examples to use the new structure.

[codecov]

Codecov Report

Attention: Patch coverage is 69.64286% with 17 lines in your changes missing coverage. Please review.

Project coverage is 71.90%. Comparing base (98b0d26) to head (18daf0a).

Files	Patch %	Lines
kwave/ktransducer.py	69.64%	14 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #437      +/-   ##
==========================================
+ Coverage   71.84%   71.90%   +0.05%     
==========================================
  Files          46       46              
  Lines        6744     6776      +32     
  Branches     1496     1503       +7     
==========================================
+ Hits         4845     4872      +27     
- Misses       1334     1337       +3     
- Partials      565      567       +2     

Flag	Coverage Δ
3.10	72.10% <69.64%> (+0.05%)	⬆️
3.11	72.10% <69.64%> (+0.05%)	⬆️
3.12	72.10% <69.64%> (+0.05%)	⬆️
3.9	71.87% <69.64%> (+0.05%)	⬆️
macos-latest	71.84% <69.64%> (+0.05%)	⬆️
ubuntu-latest	71.87% <69.64%> (+0.05%)	⬆️
windows-latest	71.88% <69.64%> (+0.05%)	⬆️

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[waltsims]

@faridyagubbayli how do you plan to make this backwards compatible?