admin_exportChain Implementation

[richardgreg]

Fixes #7813

Changes

• Declared admin_exportChain in Interface (iAdminRpcModule.cs) with the correct signature.
• Implementation (AdminRpcModule.cs):
  • Added a new constructor parameter (IJsonSerializer).
  • Implemented admin_exportChain.
• Adjusted the call in RegisterRpcModules.cs to new AdminRpcModule(...) so it provides the new IJsonSerializer parameter.
• Created a function to invoke admin_exportChain from the command line.
• Wrote a test ensuring the constructor call is valid, and the admin_exportChain method returns success and writes out the expected file.

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• Bugfix (a non-breaking change that fixes an issue)
• New feature (a non-breaking change that adds functionality)
• Breaking change (a change that causes existing functionality not to work as expected)
• Optimization
• Refactoring
• Documentation update
• Build-related changes
• Other: Description

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Documentation

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[LukaszRozmej]

We will be merging #6547 with admin_exportHistory and admin_importHistory soon, not sure if it makes sense to support this too. @asdacap @flcl42 @MarekM25