Remove basic to only use sample modules with addition test suites

[datruong-ibmmq]

Description

refactor(Node.js): replace basic* modules with sample* test suite and fix sampleresponse null-byte parsing

Removed files

• basicput.js, basicget.js, basicpublish.js, basicsubscribe.js,
  basicrequest.js, basicresponse.js
• test/basicput.test.js, test/basicget.test.js

Added files

• test/sampleput.test.js (5 suites, 5 tests)
• test/sampleget.test.js (4 suites, 4 tests)
• test/samplepublish.test.js (2 suites, 2 tests)
• test/samplesubscribe.test.js(2 suites, 2 tests)
• test/samplerequest.test.js (1 suite, 1 test)
• test/sampleresponse.test.js (3 suites, 7 tests)

Total: 21 test cases across 17 suites covering all six sample patterns.
All tests connect to a live IBM MQ broker via env.json.

Bug fix

• sampleresponse.js: JSON.parse now strips null-byte buffer padding
  before parsing (buf.toString().replace(/\0/g,'').trim()), matching
  the behaviour of the removed basicresponse.js.

• sampleresponse.js: added module.exports = { performCalc, MSG_TRESHOLD }
  to allow test-time import of pure exports.

README.md (Node.js)

• Removed all references to the deleted basic* files.
• Added per-file test breakdown table (suites, test count, description).
• Removed duplicate npm install instruction from the Tests section.