Rename nestjs-metrics-client to nestjs-metrics-reporter

[netanelavr]

Following this PR - #311
updating with the new package name

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A zero-dependency-injection alternative to Prometheus metrics solutions for NestJS.
Effortlessly report metrics from anywhere in your codebase without complex setup or dependency injection

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• NestJS / Nest: It's not nest, nestjs, nest.js, and other variants.
• Node.js: It's not nodejs, node, and other variants.