move out LinearAlgebra into its own repository (#56637)

This moves out LinearAlgebra into its own repo
https://github.com/JuliaLang/LinearAlgebra.jl. This repo is still a bit
bare (README needs to be added) but it has CI set up to run on buildkite
(https://buildkite.com/julialang/linearalgebra-dot-jl/builds/18) and doc
building on GHA. The external repo has all commits up to
4709b6c
included in it.

The reason for the move is to be able to focus issues and PRs and
development regarding LinearAlgebra in one place.

Author: KristofferC

deps/checksums/LinearAlgebra-56d561c22e1ab8e0421160edbdd42f3f194ecfa8.tar.gz/md5

@@ -0,0 +1 @@
+00198e6d92d033fb33e75cf4eac34dca

deps/checksums/LinearAlgebra-56d561c22e1ab8e0421160edbdd42f3f194ecfa8.tar.gz/sha512

@@ -0,0 +1 @@
+ba4b390d99644c31d64594352da888e9ef18021cc9b7700c37a6cdb0c1ff2532eb208ecaccf93217e3183e1db8e6c089456fa5d93633b8ff037e8796199934e7

julia.spdx.json

@@ -86,6 +86,18 @@
             "copyrightText": "Copyright (c) 2020 Stefan Karpinski <[email protected]> and contributors",
             "summary": "ArgTools provides tools for creating consistent, flexible APIs that work with various kinds of function arguments."
         },
+        {
+            "name": "LinearAlgebra.jl",
+            "SPDXID": "SPDXRef-JuliaLinearAlgebra",
+            "downloadLocation": "git+https://github.com/JuliaLang/LinearAlgebra.jl.git",
+            "filesAnalyzed": false,
+            "homepage": "https://juliastats.org",
+            "sourceInfo": "The git hash of the version in use can be found in the file stdlib/LinearAlgebra.version",
+            "licenseConcluded": "MIT",
+            "licenseDeclared": "MIT",
+            "copyrightText": "Copyright (c) 2009-2024: Jeff Bezanson, Stefan Karpinski, Viral B. Shah, and other contributors: https://github.com/JuliaLang/julia/contributors",
+            "summary": "Development repository for the LinearAlgebra standard library (stdlib) that ships with Julia."
+        },
         {
             "name": "Tar.jl",
             "SPDXID": "SPDXRef-JuliaTar",

stdlib/.gitignore

@@ -29,6 +29,8 @@
 /StyledStrings
 /JuliaSyntaxHighlighting-*
 /JuliaSyntaxHighlighting
+/LinearAlgebra-*
+/LinearAlgebra
 /*_jll/StdlibArtifacts.toml
 /*/Manifest.toml
 /*.image

stdlib/LinearAlgebra.version

@@ -0,0 +1,4 @@
+LINEARALGEBRA_BRANCH = master
+LINEARALGEBRA_SHA1 = 56d561c22e1ab8e0421160edbdd42f3f194ecfa8
+LINEARALGEBRA_GIT_URL := https://github.com/JuliaLang/LinearAlgebra.jl.git
+LINEARALGEBRA_TAR_URL = https://api.github.com/repos/JuliaLang/LinearAlgebra.jl/tarball/$1