Move iteration out of the UniformSolver (PR 1/2)

[Whebon]

Main Changes:

• Splits up UniformSolver into UniformSolver and UniformIterator.
• Adds the julianised derivation_heuristic.
• Make sure newly posted constraints are unposted on backtrack.

[ReubenJ]

As CI is still failing until HerbCore is published, I checked locally with the following setup, and all tests pass 👍

packages = [
    PackageSpec(name="HerbConstraints", rev="uniform-solver"),
    PackageSpec(name="HerbGrammar", rev="dev"),
    PackageSpec(name="HerbCore", rev="dev"),
    PackageSpec(name="HerbInterpret", rev="dev"),
    PackageSpec(name="HerbSearch", rev="uniform-solver"), 
    PackageSpec(name="HerbSpecification", rev="dev")
]

Manifest.toml

[1520ce14] AbstractTrees v0.4.5
[ec485272] ArnoldiMethod v0.4.0
[bbf7d656] CommonSubexpressions v0.3.0
[34da2185] Compat v4.14.0
[864edb3b] DataStructures v0.18.20
[86223c79] Graphs v1.10.0
[1fa96474] HerbConstraints v0.2.1 `https://github.com/Herb-AI/HerbConstraints.jl.git#uniform-solver`
[2b23ba43] HerbCore v0.3.0 `https://github.com/Herb-AI/HerbCore.jl.git#dev`
[4ef9e186] HerbGrammar v0.2.2 `https://github.com/Herb-AI/HerbGrammar.jl.git#dev`
[d25df0c9] Inflate v0.1.4
[692b3bcd] JLLWrappers v1.5.0
[b964fa9f] LaTeXStrings v1.3.1
[d8e11817] MLStyle v0.4.17
[1914dd2f] MacroTools v0.5.13
[bac558e1] OrderedCollections v1.6.3
[aea7be01] PrecompileTools v1.2.1
[21216c6a] Preferences v1.4.3
[ae029012] Requires v1.3.0
[699a6c99] SimpleTraits v0.9.4
[90137ffa] StaticArrays v1.9.3
[1e83bf80] StaticArraysCore v1.4.2
[b4f28e30] TikzGraphs v1.4.0
[37f6aa50] TikzPictures v3.5.0
[39424ebd] TreeView v0.5.1
[6e34b625] Bzip2_jll v1.0.8+1
[83423d85] Cairo_jll v1.18.0+1
[2e619515] Expat_jll v2.5.0+0
[a3f928ae] Fontconfig_jll v2.13.93+0
[d7e528f0] FreeType2_jll v2.13.1+0
[78b55507] Gettext_jll v0.21.0+0
[7746bdde] Glib_jll v2.80.0+0
[3b182d85] Graphite2_jll v1.3.14+0
[655565e8] HarfBuzz_ICU_jll v2.8.1+0
[2e76f6c2] HarfBuzz_jll v2.8.1+1
⌅ [a51ab1cf] ICU_jll v69.1.0+0
[aacddb02] JpegTurbo_jll v3.0.2+0
[88015f11] LERC_jll v3.0.0+1
[1d63c593] LLVMOpenMP_jll v15.0.7+0
[dd4b983a] LZO_jll v2.10.1+0
⌅ [e9f186c6] Libffi_jll v3.2.2+1
[d4300ac3] Libgcrypt_jll v1.8.7+0
[7add5ba3] Libgpg_error_jll v1.42.0+0
[94ce4f54] Libiconv_jll v1.17.0+0
[4b2f31a3] Libmount_jll v2.39.3+0
⌅ [89763e89] Libtiff_jll v4.4.0+0
[38a345b3] Libuuid_jll v2.39.3+1
⌃ [d3a379c0] LittleCMS_jll v2.12.0+0
⌃ [643b3616] OpenJpeg_jll v2.4.0+0
⌅ [458c3c95] OpenSSL_jll v1.1.23+0
[30392449] Pixman_jll v0.42.2+0
⌅ [9c32591e] Poppler_jll v21.9.0+0
[02c8fc9c] XML2_jll v2.12.6+0
[aed1982a] XSLT_jll v1.1.34+0
[4f6342f7] Xorg_libX11_jll v1.8.6+0
[0c0b7dd1] Xorg_libXau_jll v1.0.11+0
[a3789734] Xorg_libXdmcp_jll v1.1.4+0
[1082639a] Xorg_libXext_jll v1.3.4+4
[ea2f1a96] Xorg_libXrender_jll v0.9.10+4
[14d82f49] Xorg_libpthread_stubs_jll v0.1.1+0
[c7cfdc94] Xorg_libxcb_jll v1.15.0+0
[c5fb5394] Xorg_xtrans_jll v1.5.0+0
[3161d3a3] Zstd_jll v1.5.6+0
[b53b4c65] libpng_jll v1.6.43+1
⌅ [d7dd28d6] tectonic_jll v0.13.1+0
[0dad84c5] ArgTools v1.1.1
[56f22d72] Artifacts
[2a0f44e3] Base64
[ade2ca70] Dates
[8ba89e20] Distributed
[f43a241f] Downloads v1.6.0
[7b1f6079] FileWatching
[b77e0a4c] InteractiveUtils
[b27032c2] LibCURL v0.6.4
[76f85450] LibGit2
[8f399da3] Libdl
[37e2e46d] LinearAlgebra
[56ddb016] Logging
[d6f4376e] Markdown
[a63ad114] Mmap
[ca575930] NetworkOptions v1.2.0
[44cfe95a] Pkg v1.10.0
[de0858da] Printf
[3fa0cd96] REPL
[9a3f8284] Random
[ea8e919c] SHA v0.7.0
[9e88b42a] Serialization
[1a1011a3] SharedArrays
[6462fe0b] Sockets
[2f01184e] SparseArrays v1.10.0
[10745b16] Statistics v1.10.0
[fa267f1f] TOML v1.0.3
[a4e569a6] Tar v1.10.0
[8dfed614] Test
[cf7118a7] UUIDs
[4ec0a83e] Unicode
[e66e0078] CompilerSupportLibraries_jll v1.1.0+0
[deac9b47] LibCURL_jll v8.4.0+0
[e37daf67] LibGit2_jll v1.6.4+0
[29816b5a] LibSSH2_jll v1.11.0+1
[c8ffd9c3] MbedTLS_jll v2.28.2+1
[14a3606d] MozillaCACerts_jll v2023.1.10
[4536629a] OpenBLAS_jll v0.3.23+4
[efcefdf7] PCRE2_jll v10.42.0+1
[bea87d4a] SuiteSparse_jll v7.2.1+1
[83775a58] Zlib_jll v1.2.13+1
[8e850b90] libblastrampoline_jll v5.8.0+1
[8e850ede] nghttp2_jll v1.52.0+1
[3f19e933] p7zip_jll v17.4.0+2