single Init function and states of SDK in core package

[storybehind]

Changes

• Provide a single Init function and maintain the states of SDK in core/client package
• Refactor zcncore package to use these function, states and mark appropriate functions as Deprecated to indicate to the users of SDK.

Fixes

• No Fixes

Tests

Tasks to complete before merging PR:

• [ ] Ensure system tests are passing. If not Run them manually to check for any regressions :clipboard:
• [ ] 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):

• blobber:
• 0chain:
• system_test:
• zboxcli:
• zwalletcli:
• Other: ...