Compress the transaction code on serialization

[bchamagne]

Description

• Compress code when serializing it (network & db)
• Check code size on compressed code

Fixes #1299

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Tested with following scenarios:

• an existing contract is triggered in the newer version
• a new contract is triggered
• explorer can read transactions with zipped or unzipped code

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules