Added typescript

[kautukkundan]

What does this pull request do? Explain your changes. (required)

adds typescript support to the repository for migrating to hardhat environment from truffle

Specific updates (required)

• added types and dependencies for typescript
• Added tsconfig
• changed hardhat config to use typescript imports

How did you test each of these updates (required)

Does this pull request close any open issues?

closes #415 #418

Checklist:

• [ ] README and other documentation updated
• [x] All tests using npm run test pass

[coveralls]

Pull Request Test Coverage Report for Build d30e8e72-b8ba-4bf2-9fb6-46e8705ef1ce

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.124%

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Totals
Change from base Build 66b409ed-a1bd-457d-a5cb-f87564f760e3:	0.0%
Covered Lines:	859
Relevant Lines:	865

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💛 - Coveralls