Feature: Allow API calls before load

[MoumitaM]

Description of the change

This feature will enable the SDK methods to be called before load.

• All the previously called methods will be pushed to the call stack after load in the same order.
• Ex: Say the call stack currently have [page, identify, load, track]. It will become [load, page, identify, track]

Type of change

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

Related issues

Fix #1

Checklists

Development

• Lint rules pass locally
• The code changed/added as part of this pull request has been covered with tests
• All tests related to the changed code pass in development

Code review

• This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
• "Ready for review" label attached to the PR and reviewers mentioned in a comment
• Changes have been reviewed by at least one other engineer
• Issue from task tracker has a link to this pull request

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This change is 

[saikumarrs]

Added requested changes as comments.