make bigInt more applicability in adaptive-expressions

[Danieladu]

Fixes #2211
Currently, JS sdk uses Number to handler all number input, and with BigInt to handler ticks().
Here SDK provides such a solution to reduce the gap between these two languages:

• Keep the range gap of the normal number.-2^63 ~ 2^63 -1 for C# and -2^53+1 ~ 2^53 for JS. (JS would provide inaccurate calculation of numbers beyond this range)
• Provide a solution to convert bigint object into a normal number in js. int() function can accept a bigint input, and output a fuzzy number output.
  For example: int(ticks(utcNow())) - 1 would be valid and the output would be a number. But the accuracy of the output is not guaranteed

[coveralls]

Pull Request Test Coverage Report for Build 497494041

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.003%) to 84.5%

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Totals
Change from base Build 497493701:	0.003%
Covered Lines:	17819
Relevant Lines:	20147

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💛 - Coveralls