fix: check global var process

[ghost]

Description

This PR checks if the global variable process exists.

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 #429 (bb99bdc) into dev (3c243fc) will increase coverage by 0.30%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev     #429      +/-   ##
==========================================
+ Coverage   82.12%   82.42%   +0.30%     
==========================================
  Files          43       44       +1     
  Lines        1807     1844      +37     
  Branches      332      341       +9     
==========================================
+ Hits         1484     1520      +36     
- Misses        322      323       +1     
  Partials        1        1              

Impacted Files	Coverage Δ
packages/zilliqa-js-crypto/src/random.ts	96.96% <100.00%> (+2.23%)	:arrow_up:
packages/zilliqa-js-crypto/src/index.ts	100.00% <0.00%> (ø)
packages/zilliqa-js-crypto/src/signature.ts	88.88% <0.00%> (ø)

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