Release v2.0.0 (@W-18482922@)

[joeluong-sfcc]

This PR release v2.0.0 of the commerce-sdk-core. This is a major version release as we now URL encode path parameters by default.

This PR also fixes a unit test that was using proxyquire as it was no longer compatible with node 22 as it hasn't been actively updated in 6 years. The fix was to create a mock of StaticClient to replicate the behavior. Ideally we use the StaticClient file directly and mock out the fetch call, but unfortunately:

1. nock doesn't allow us to check the fetchOptions passed into the fetch call which is what we desire
2. There's no easy way to mock out the fetch import from make-fetch-happen without introducing another testing library like jest

TypeError: Cannot read properties of undefined (reading 'require')
    at Proxyquire.load (/home/runner/work/commerce-sdk-core/commerce-sdk-core/node_modules/proxyquire/lib/proxyquire.js:129:72)
    at Suite.<anonymous> (/home/runner/work/commerce-sdk-core/commerce-sdk-core/test/fetchOptions.test.ts:16:34)
    at Object.create (/home/runner/work/commerce-sdk-core/commerce-sdk-core/node_modules/mocha/lib/interfaces/common.js:148:19)
    at context.describe.context.context (/home/runner/work/commerce-sdk-core/commerce-sdk-core/node_modules/mocha/lib/interfaces/bdd.js:42:27)
    at Object.<anonymous> (/home/runner/work/commerce-sdk-core/commerce-sdk-core/test/fetchOptions.test.ts:13:1)
    at Module._compile (node:internal/modules/cjs/loader:1688:14)
    at Module.m._compile (/home/runner/work/commerce-sdk-core/commerce-sdk-core/node_modules/ts-node/src/index.ts:858:23)
    at node:internal/modules/cjs/loader:1820:10
    at Object.require.extensions.<computed> [as .ts] (/home/runner/work/commerce-sdk-core/commerce-sdk-core/node_modules/ts-node/src/index.ts:861:12)
    at Module.load (node:internal/modules/cjs/loader:1423:32)
    at Function._load (node:internal/modules/cjs/loader:1246:12)
    at TracingChannel.traceSync (node:diagnostics_channel:322:14)
    at wrapModuleLoad (node:internal/modules/cjs/loader:235:24)
    at Module.require (node:internal/modules/cjs/loader:1445:12)
    at require (node:internal/modules/helpers:135:16)
    at Object.exports.requireOrImport (/home/runner/work/commerce-sdk-core/commerce-sdk-core/node_modules/mocha/lib/nodejs/esm-utils.js:60:20)
    at Object.exports.loadFilesAsync (/home/runner/work/commerce-sdk-core/commerce-sdk-core/node_modules/mocha/lib/nodejs/esm-utils.js:103:20)
    at singleRun (/home/runner/work/commerce-sdk-core/commerce-sdk-core/node_modules/mocha/lib/cli/run-helpers.js:125:3)
    at Object.exports.handler (/home/runner/work/commerce-sdk-core/commerce-sdk-core/node_modules/mocha/lib/cli/run.js:374:5)

Given these limitations I thought the best approach was just to simulate the behavior of StaticClient.