Allow mixing ranges and values to construct sequences

[edgarfgp]

Description

Implements RFC FS-1031: Mixing ranges and values to construct sequences https://github.com/fsharp/fslang-design/pull/804

Before

let a = seq { yield! seq { 1..10 }; 19 }
let b = [-3; yield! [1..10]]
let c = [|-3; yield! [|1..10|]; 19|]

After

let a = seq { 1..10; 19 }
let b = [-3; 1..10]
let c = [|-3; 1..10; 19|]

Checklist

• [x] Test cases added
• [x] Add LanguageFeature
• [x] RFC
• [x] Release notes entry updated

[github-actions[bot]]

:heavy_exclamation_mark: Release notes required

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:white_check_mark: Found changes and release notes in following paths:

Change path	Release notes path	Description
src/Compiler	docs/release-notes/.FSharp.Compiler.Service/10.0.100.md
LanguageFeatures.fsi	docs/release-notes/.Language/preview.md