Add gate name setter

[YonatanGideoni]

What

Adds a setter/getter for the Instruction.name attribute (in a backwards compatible manner)

Why

When changing name directly ideal gate does not change accordingly - Closes #233

How

Implemented getter/setter and changed current name attribute to be _name. Also made the exporting/importing still work with this change.

Remarks

Should not break anything and be totally transparent.

Checklist

Please include and complete the following checklist. Your Pull Request is (in most cases) not ready for review until the following have been completed. You can create a draft PR while you are still completing the checklist. Check the Contribution Guidelines for more details. You can mark an item as complete with the - [x] prefix

• [x] Tests - Added unit tests for new code, regression tests for bugs and updated the integration tests if required
• [x] Formatting & Linting - black and flake8 have been used to ensure styling guidelines are met
• [x] Type Annotations - All new code has been type annotated in the function signatures using type hints
• [x] Docstrings - Docstrings have been provided for functions in the numpydoc style
• [x] Documentation - The tutorial style documentation has been updated to explain changes & new features
• [x] Notebooks - Example notebooks have been updated to incorporate changes and new features
• [x] Changelog - A short note on this PR has been added to the Upcoming Release section

[codecov[bot]]

Codecov Report

Merging #234 (4fac852) into dev (60dfd01) will increase coverage by 0.02%. The diff coverage is 89.47%.

@@            Coverage Diff             @@
##              dev     #234      +/-   ##
==========================================
+ Coverage   74.85%   74.87%   +0.02%     
==========================================
  Files          38       38              
  Lines        5535     5549      +14     
==========================================
+ Hits         4143     4155      +12     
- Misses       1392     1394       +2     

Impacted Files	Coverage Δ
c3/signal/gates.py	94.89% <89.47%> (-0.71%)	:arrow_down:

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