invoke pvm unit tests

[qiweiii]

test invokePVM function with standard programs, with this we can move on to testing host calls and VM invocations

[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 7 lines in your changes missing coverage. Please review.

Project coverage is 79.94%. Comparing base (e839513) to head (0b005dc).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
PolkaVM/Tests/PolkaVMTests/InvokePVMTest.swift	94.84%	5 Missing ⚠️
.../Blockchain/VMInvocations/HostCall/HostCalls.swift	0.00%	1 Missing ⚠️
PolkaVM/Sources/PolkaVM/Memory.swift	93.75%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #269      +/-   ##
==========================================
+ Coverage   78.66%   79.94%   +1.28%     
==========================================
  Files         299      300       +1     
  Lines       23977    24079     +102     
==========================================
+ Hits        18861    19250     +389     
+ Misses       5116     4829     -287     

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