Add benchmark suite for serialization

[AbhiPrasad]

Problem Statement

Ref: #4579

We have various functions for normalization and serialization in the SDK. This is primarily through

sentry-javascript/packages/utils/src/object.ts

Line 312 in 0a6e535

export function walk(key: string, value: any, depth: number = +Infinity, memo: MemoFunc = memoBuilder()): any {

.

We should increase the test coverage (perhaps by fuzzing?) against this. We should then better instrument the performance of this.

Solution Brainstorm

Use something like https://benchmarkjs.com/?

Perhaps we can run https://gitlab.com/gitlab-org/security-products/analyzers/fuzzers/jsfuzz in CI?