Feature request: Allow to run math.config in math block

[chenfengyuan]

Have you searched existing Github issues to see if someone has already requested this feature?
Yes

Is your feature request related to a problem? Please describe.
I want to use BigNumbers instead of numbers in math.js by default

Describe the solution you'd like
Allow to run math.config, so than I can run

math.config({
  number: 'BigNumber',      // Default type of number:
                            // 'number' (default), 'BigNumber', or 'Fraction'
  precision: 64,            // Number of significant digits for BigNumbers
  relTol: 1e-60,
  absTol: 1e-63
})

// use math
math.evaluate('0.1 + 0.2')  // BigNumber, 0.3

Describe alternatives you've considered
An option config can be passed to math.config.

Additional context
Add any other context or screenshots about the feature request here.