feat: add svn completion spec

[sh-sabbir]

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) Feature

What is the current behavior? (You can also link to an open issue here) Currently not available

What is the new behavior (if this is a feature change)? Partial support for SVN auto-completion

Additional info: Added support for a few subcommands. But I'll continue improving the spec by adding more properties to the spec

[withfig-bot]

Overview

src/svn.ts:

Info:

src/date.ts:

Info:

[withfig-bot]

Hello @sh-sabbir, thank you very much for creating a Pull Request! Here is a small checklist to get this PR merged as quickly as possible:

• [ ] Do all subcommands / options which take arguments include the args property (args: {})?
• [ ] Are all options modular? E.g. -a -u -x instead of -aux
• [ ] Have all other checks passed?

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