Add perf notes archive (dotnet#16504)

Author: psfinaki

docs/perf-discussions-archive.md

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+This is just a typed version of [these notes](https://github.com/dotnet/fsharp/issues/16498), generated during perf discussions on summer of 2023. Can be used as a reference point.
+
+---
+
+# Comparisons
+- OCaml
+- Scala
+- C#
+- Rust
+
+# Underlying problems
+- LOH allocations
+- Build does too much for deltas
+- GC Gen 2
+
+# Major problems
+- Script start up CLI
+- Build on Linux & Mac
+- Glitches in test discovery
+- Edit & test workflow
+- Edit & run workflow
+- Edit & check workflow
+- Unnecessary rebuilds
+
+# Hosted compiler problems
+- Stamp overflow
+- Non-deterministic
+- Memory leaks
+- Infinite loops
+- Stay resident compiler
+- Permission elevation
+
+# Minor problems
+- Benchmarking
+- Squigglies
+- Colorization
+- Debug
+- Press dot
+
+# Incremental phases
+- Incremental parsing file
+- Incremental checking file
+- Incremental optimization for deltas
+- Cascading DLL builds
+- Incremental DLL builds
+- Incremental ILxGen for deltas
+- Incremental assembly generation
+- Incremental PDB generation for deltas
+
+# Community guidelines
+- Community leadership
+- Community enablement for tool performance
+- Performance acceptance criteria
+- Performance running
+- Docs for tooling performance