Add meter method which returns remaining computation for given computation kind

[turbolent]

For onflow/cadence#2853. See onflow/cadence#2853 (comment)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 28.57143% with 15 lines in your changes missing coverage. Please review.

Project coverage is 41.28%. Comparing base (0dde730) to head (e8d75b6).

Files with missing lines	Patch %	Lines
fvm/storage/state/execution_state.go	0.00%	6 Missing ⚠️
fvm/environment/mock/meter.go	0.00%	3 Missing ⚠️
fvm/environment/meter.go	0.00%	2 Missing ⚠️
fvm/meter/computation_meter.go	75.00%	1 Missing and 1 partial ⚠️
fvm/storage/state/transaction_state.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6215   +/-   ##
=======================================
  Coverage   41.28%   41.28%           
=======================================
  Files        2033     2033           
  Lines      145981   145999   +18     
=======================================
+ Hits        60269    60278    +9     
- Misses      79486    79493    +7     
- Partials     6226     6228    +2     

Flag	Coverage Δ
unittests	41.28% <28.57%> (+<0.01%)	⬆️

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[bluesign]

Is this stale?

[janezpodhostnik]

@bluesign ComputationAvailable was added in another PR https://github.com/onflow/flow-go/pull/4861/files#diff-f0abf60d6957bfe1c0f9a9c50108652f85d6515ca786892300f48b76e0144f86R100