Change compiler default setting for compressedMetada

[KevinRansom]

**With F# 9.0 Compiler:

• Switch FSharp.Core and FSharp.Compiler.Service to compressedmetadata+

• Change default to compressedmetadata+, when building assemblies.**

This reduces the size of built assemblies by allowing us to embed compressed signaturedata and optimizationdata in assemblies.
F# Compilers before F# 7.0 cannot read compressedMetadata to revert to old behavior use:
--compressedmetadata-
or the build property
<CompressedMetadata>false</CompressedMetadata>