Problem: need to add JSON-RPC endpoint personal_initializeWallet

[adu-web3]

Closes #738

• this is aimed at smartcard wallet which is not supported yet.

Description

• this is aimed at smartcard wallet which is not supported yet.
• an error with unsupported message will be returned for now.

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For contributor use:

• Targeted PR against correct branch (see CONTRIBUTING.md)
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration tests
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Added a relevant changelog entry to the Unreleased section in CHANGELOG.md
• Re-reviewed Files changed in the Github PR explorer

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For admin use:

• Added appropriate labels to PR (ex. WIP, R4R, docs, etc)
• Reviewers assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[fedekunze]

LGTM, minor comment. Can you add a changelog entry?

[fedekunze]

@Muggle-Du can you fix the rpc tests?

=== RUN   TestPersonal_Unpair
    personal_test.go:150: 
        	Error Trace:	personal_test.go:150
        	Error:      	Should be true
        	Test:       	TestPersonal_Unpair
--- FAIL: TestPersonal_Unpair (1.00s)
=== RUN   TestPersonal_InitializeWallet
    personal_test.go:155: 
        	Error Trace:	personal_test.go:155
        	Error:      	Should be true
        	Test:       	TestPersonal_InitializeWallet
--- FAIL: TestPersonal_InitializeWallet (1.00s)

[adu-web3]

@Muggle-Du can you fix the rpc tests?

=== RUN   TestPersonal_Unpair
    personal_test.go:150: 
        	Error Trace:	personal_test.go:150
        	Error:      	Should be true
        	Test:       	TestPersonal_Unpair
--- FAIL: TestPersonal_Unpair (1.00s)
=== RUN   TestPersonal_InitializeWallet
    personal_test.go:155: 
        	Error Trace:	personal_test.go:155
        	Error:      	Should be true
        	Test:       	TestPersonal_InitializeWallet
--- FAIL: TestPersonal_InitializeWallet (1.00s)

ok, I'll check and fix
Now all testcases including the added ones can pass @fedekunze