Add publish with retry method

[HenriqueNogara]

Description of change

Adds a method for promoting/reattaching messages sent to the tangle.

Links to any relevant issues

closes #426

Type of change

• Bug fix (a non-breaking change which fixes an issue)
• Enhancement (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Fix

How the change has been tested

Change checklist

• I have followed the contribution guidelines for 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
• 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

[cycraig]

Looks good to me!

[PhilippGackstatter]

Thanks for the changes. Just some restructuring and not sure whether we need the new error. Other than that, looks good now!

[cycraig]

The timeout for the Wasm examples/tests probably needs to be increased to account for the new confirmation delay on publishing.

identity.rs/bindings/wasm/cypress/integration/browser_test.js

Line 9 in 0d33215

defaultCommandTimeout: 180000, // 3 minutes to account for spurious network delays

identity.rs/bindings/wasm/examples/src/test.js

Line 13 in 0d33215

jest.setTimeout(180000); // 3 minutes to account for spurious network delays, most tests pass in a few seconds