Feature/list recent files

[lpoli]

This PR contains command that lists recently added refs.

Tasks to complete before merging PR:

• Ensure system tests are passing. If not Run them manually to check for any regressions 📋
• Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• Merge your system tests PR to master AFTER merging this PR

Associated PRs (Link as appropriate):

• 0chain:
• blobber: Feature/list recent files blobber#755
• gosdk: Feature/list recent files gosdk#532
• system_test: Feature/recent refs system_test#369
• zwalletcli:
• Other: ...

[service-0chain]

Manual system tests [failure] with the following config

config	value
tests skipped	FALSE
system-tests	feature/recent-refs
gosdk	feature/list-recent-files
zboxcli	feature/list-recent-files
zwalletcli	staging
0chain	staging
blobber	staging
authorizer	staging
0box	staging
0block	staging
0dns	staging
explorer	staging
0proxy	staging
0search	staging

[peterlimg]

lgtm