add log host call

[qiweiii]

spec: https://hackmd.io/@polkadot/jip1

[codecov]

Codecov Report

Attention: Patch coverage is 51.79856% with 67 lines in your changes missing coverage. Please review.

Project coverage is 79.12%. Comparing base (324a43f) to head (67d088c).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
.../Blockchain/VMInvocations/HostCall/HostCalls.swift	41.09%	43 Missing ⚠️
...Invocations/InvocationContexts/RefineContext.swift	0.00%	15 Missing ⚠️
...tions/InvocationContexts/IsAuthorizedContext.swift	0.00%	5 Missing ⚠️
...cations/InvocationContexts/AccumulateContext.swift	0.00%	2 Missing ⚠️
...cations/InvocationContexts/OnTransferContext.swift	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #264      +/-   ##
==========================================
- Coverage   79.36%   79.12%   -0.25%     
==========================================
  Files         297      298       +1     
  Lines       23411    23536     +125     
==========================================
+ Hits        18580    18622      +42     
- Misses       4831     4914      +83     

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