[FSharp] Fix: Improve FSharp Falco benchmarks by moving to Dapper

[SIRHAMY]

Updating FSharp Falco benchmark to improve its performance.

Context

• Falco has been trailing Giraffe even though they are both similar under the hood.
• Giraffe uses Dapper instead of a raw Npgsql connection / command for data reads (github)
• So here we move to Dapper to make the benchmark more similar to Giraffe's

Results

Running this locally: ./tfb --test falco

• Original fortunes - 512 connections @ 109k requests / second
• New with Dapper - 512 connections @ 160k requests / second (46% increase)

All verifications pass:

[SIRHAMY]

cc @pimbrouwers (Falco maintainer) in case you want to review / make changes

[pimbrouwers]

You da man! Thank you for this. Makes this much more apples to apples.