Add initializing wallet configuration with bdk-cli wallet init

[tvpeter]

Description

This PR adds bdk-cli wallet init command to save wallet configuration information to config.toml file in the data directory.

Fixes #192

Notes to the reviewers

• Reusing the exported serde crate from bdk_wallet did not offer the derive feature
• CLI parameters have higher precedence over saved config values

Checklists

All Submissions:

• I've signed all my commits
• I followed the contribution guidelines
• I ran cargo fmt and cargo clippy before committing

New Features:

• I've added tests for the new feature
• I've added docs for the new feature
• I've updated CHANGELOG.md

[coveralls]

Pull Request Test Coverage Report for Build 15923676961

Details

• 0 of 237 (0.0%) changed or added relevant lines in 5 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.3%) to 2.372%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/main.rs	0	3	0.0%
src/utils.rs	0	26	0.0%
src/commands.rs	0	34	0.0%
src/config.rs	0	84	0.0%
src/handlers.rs	0	90	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/utils.rs	2	0.0%

Totals
Change from base Build 15731603419:	-0.3%
Covered Lines:	25
Relevant Lines:	1054

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💛 - Coveralls

[notmandatory]

I like the approach for loading the config file parameters if the file exists, but is there a reason you didn't add a CLI bdk-cli wallet init ... command in rust to create the config file rather than using just ?

Creating the config file in rust should be easier to maintain/keep in sync than your just approach and shouldn't take too much more than adding the Serialize trait to WalletConfigInner. You should be able to reuse the WalletOpts to capture the values with clap that you need to put in the config file too.

[tvpeter]

I like the approach for loading the config file parameters if the file exists, but is there a reason you didn't add a CLI bdk-cli wallet init ... command in rust to create the config file rather than using just ?

Creating the config file in rust should be easier to maintain/keep in sync than your just approach and shouldn't take too much more than adding the Serialize trait to WalletConfigInner. You should be able to reuse the WalletOpts to capture the values with clap that you need to put in the config file too.

Alright, I will update.

[tvpeter]

Alright, I will update.

@notmandatory I have updated the PR