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refactor: Removed dependency on lodash.assign (#395)

Summary:

to reduce package size, we are trying to gradually get rid of lodash library. This PR replaces assign function with Object.assign. Also added a polyfill method to support old browsers. Polyfill was taken from MDN. 

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign#Polyfill

Test Plan:

All tests pass after this change

643 of 715 branches covered (89.93%)

Branch coverage included in aggregate %.

7064 of 7199 relevant lines covered (98.12%)

274.96 hits per line