feat: bump llama.cpp, add gguf support (#943)

**Description**

This PR syncs up the `llama` backend to use `gguf`
(https://github.com/go-skynet/go-llama.cpp/pull/180). It also adds
`llama-stable` to the targets so we can still load ggml. It adapts the
current tests to use the `llama-backend` for ggml and uses a `gguf`
model to run tests on the new backend.

In order to consume the new version of go-llama.cpp, it also bump go to
1.21 (images, pipelines, etc)

---------

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

.github/workflows/release.yaml

@@ -22,6 +22,9 @@ jobs:
         uses: actions/checkout@v3
         with:
           submodules: true
+      - uses: actions/setup-go@v4
+        with:
+          go-version: '>=1.21.0'
       - name: Dependencies
         run: |
           sudo apt-get update
@@ -60,6 +63,9 @@ jobs:
         uses: actions/checkout@v3
         with:
           submodules: true
+      - uses: actions/setup-go@v4
+        with:
+          go-version: '>=1.21.0'
       - name: Build
         id: build
         env:

.github/workflows/test.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go-version: ['1.20.x', 'stable']
+        go-version: ['1.21.x']
     steps:
       - name: Clone
         uses: actions/checkout@v3
@@ -63,7 +63,7 @@ jobs:
     runs-on: macOS-latest
     strategy:
       matrix:
-        go-version: ['1.20.x', 'stable']
+        go-version: ['1.21.x']
     steps:
       - name: Clone
         uses: actions/checkout@v3