feat(request-client): made verbose mode easier to configure

[YuryShkoda]

Intent

• Add verbose option to sasjsconfig.
• Add public methods to enable/disable verbose mode.

Implementation

• Changed the constructor method of RequestClient to make verbose mode configurable when an instance of RequestClient is instantiated.
• Added enableVerboseMode and disableVerboseMode public methods to src/SASjs.ts.
• Updated README.md.

Checks

No PR (that involves a non-trivial code change) should be merged, unless all items below are confirmed! If an urgent fix is needed - use a tar file.

• [x] All sasjs-cli unit tests are passing (npm test).
• (CI Runs this) All sasjs-tests are passing. If you want to run it manually (instructions available here).
• [ ] Data Controller builds and is functional on both SAS 9 and Viya

[github-actions[bot]]

Coverage report

Total coverage

Status	Category	Percentage	Covered / Total
🟡	Statements	63.51%	2076/3269
🔴	Branches	44.8%	754/1683
🔴	Functions	54.05%	307/568
🟡	Lines	73.05%	3470/4750

Status of coverage: 🟢 - ok, 🟡 - slightly more than threshold, 🔴 - under the threshold

Show files with reduced coverage 🔻

### Reduced coverage | Status | Filename | Statements | Branches | Functions | Lines | | :----: | :--------------------------- | :--------- | :------- | :-------- | :----------------- | | 🟡 | src/request/RequestClient.ts | 65.61% | 55.7% | 59.7% | 76.08% | | 🔴 | src/SASjs.ts | 30.18% | 6.25% | 10% | 59.58% (+1.39% 🔼) | > Status of coverage: 🟢 - ok, 🟡 - slightly more than threshold, 🔴 - under the threshold

Report generated by 🧪jest coverage report action from e511cd613ccfb039189c7e6406dd4dcf505b3533