feat[ux]: move exception hint to the end of the message

[cyberthirst]

What I did

• moved the (hint: ...) to be reported as the last item to improve the readability
• the hint should be displayed after the actual problem has been described, ie, as the last item

example:

original:

vyper.exceptions.InvalidOperation: Cannot perform decimal division on uint256

  (hint: did you mean `10 // 4`?)

  contract "tests/custom/test.vy:3", function "f", line 3:17 
       2 def f(x: Bytes[32*5]):
  ---> 3     k: uint256 = 10 / 4
  ------------------------^

new order:

vyper.exceptions.InvalidOperation: Cannot perform decimal division on uint256

  contract "tests/custom/test.vy:3", function "f", line 3:17 
       2 def f(x: Bytes[32*5]):
  ---> 3     k: uint256 = 10 / 4
  ------------------------^

  (hint: did you mean `10 // 4`?)

edit: fix the example

How to verify it

Commit message

moved the `(hint: ...)` to be reported at the end of the exception to
improve the readability. the hint should be displayed after the actual
problem has been described, i.e. as the last item in the exception
message.

Description for the changelog

Cute Animal Picture

[cyberthirst]

Given how close the 0.4.0 release is, I think it might be wise to merge after the release.

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 46.17%. Comparing base (f909d6e) to head (f076af0).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
vyper/exceptions.py	25.00%	6 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (f909d6e) and HEAD (f076af0). Click for more details.

HEAD has 139 uploads less than BASE

Flag	BASE (f909d6e)	HEAD (f076af0)
	140	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4154       +/-   ##
===========================================
- Coverage   91.35%   46.17%   -45.18%     
===========================================
  Files         109      109               
  Lines       15635    15641        +6     
  Branches     3443     3443               
===========================================
- Hits        14283     7222     -7061     
- Misses        920     7866     +6946     
- Partials      432      553      +121     

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[cyberthirst]

The current version changes the message property semantics by excluding the hint. Given how the property is used in the broader context, it should be valid.