[TASK] bump version to 1.2.4

and add contributor
[TASK] add publish scripts
[DOC] update release notes
[DOC] update CONTRIBUTORS.md
[DOC] update package.json
[TASK] bump version to 1.3.0-rc1
[DOC] update release notes
[DOC] update release notes
[TEST] payments mock flow

[TEST] xrp sending and reserve base xrp values

updates

status url check

[test] xrp mock flow