build: tslib as dependency

[ghost]

Description

This PR adds tslib as dependency. As of TypeScript 3.9, tslib version of 2.x is required to build new applications.

The tslib is a runtime library for Typescript. The version of this library is bound to the version of the TypeScript compiler used to compile a library. Peer dependencies do not accurately represent this relationship between the runtime and the compiler. https://angular.io/guide/migration-update-libraries-tslib#why-is-this-migration-necessary

Users have been asked to install tslib since https://github.com/Zilliqa/Zilliqa-JavaScript-Library/pull/169.

yarn add @zilliqa-js/zilliqa
# you may also need to install the tslib package.
yarn add tslib
# bn.js should be added with the above package. if it is not, install it manually.
yarn add bn.js

References:

• https://github.com/Zilliqa/Zilliqa-JavaScript-Library/issues/167
• https://github.com/angular/angular/blob/master/packages/core/package.json
• https://github.com/ionic-team/ionic-framework/issues/23090
• https://github.com/ionic-team/ionic-framework/commit/0cdd326a4a02729a306bccfcadca7370475eae32

Motivation and Context

How has this been tested?

Screenshots (if appropriate):

Types of changes

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

Checklist:

• [ ] Add tests to cover changes as needed.
• [ ] Update documentation as needed.

[codecov-commenter]

Codecov Report

Merging #406 (3689d9e) into dev (96c014e) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 3689d9e differs from pull request most recent head 48f49f0. Consider uploading reports for the commit 48f49f0 to get more accurate results

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  Coverage   81.28%   81.28%           
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  Files          43       43           
  Lines        1811     1811           
  Branches      334      334           
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  Hits         1472     1472           
  Misses        338      338           
  Partials        1        1           

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