perf: monomorphic logevent

[lukecotter]

Description

The goal of this PR is to improve Log Parser performance, primarily through ensuring objects are monomorphic which helps engines optimise especially in tight loops.

It will also address some other performance improvements and restructure the files e.g separate file for the types

Specifics

• Do not define properties outside constructor e.g

dont

class Foo {
  bar = 1;
}

do

class Foo {
  constructor() {
    this.bar = 1;
  }
}

• Consistent field assignment order
• Use simple objects instead of classes where possible
• Composition over inheritence
• Use stream reader instead of fecth.data.text() when reading log
• Optimise functions that navigate the tree

Type of change (check all applicable)

• 🐛 Bug fix
• ✨ New feature
• ♻️ Refactor
• ⚡ Performance Improvement
• 📝 Documentation
• 🔧 Chore
• 💥 Breaking change

[optional] Any images / gifs / video

Related Tickets & Documents

resolves #552
Related Issue #
fixes #
closes #

Added tests?

• 👍 yes
• 🙅 no, not needed
• 🙋 no, I need help

Added to documentation?

• 🔖 README.md
• 🔖 CHANGELOG.md
• 📖 help site
• 🙅 not needed

[optional] Are there any post-deployment tasks we need to perform?

[lcottercertinia]

Some changes have moved to #612.
Some of these and future changes in this PR are too risky this close to release.