refactor!: change Package API

This changes the following public APIs:

**(_breaking_) Events on the `Package` class**
The `uninstall:success` event on the `Package` class now receives an `InstallReceipt` as argument, instead of an
`InstallHandle`. This receipt is an in-memory representation of what was uninstalled. There's also a new
`uninstall:failed` event for situations where uninstallation for some
reason fails. Note: this also applies to the registry events (i.e.
`package:uninstall:success` and `package:uninstall:failed`).

---

**(_breaking_) `Package:uninstall()` is now asynchronous and receives two new arguments, similarly to `Package:install()`**
While package uninstallations remain synchronous under the hood, the public API has been changed from synchronous ->
asynchronous. Users of this method are recommended to provide a callback in situations where code needs to execute after
uninstallation fully completes.

---

**(_breaking_) `Package:get_install_path()` has been removed.

---

**`Package:install()` now takes an optional callback**
This callback allows consumers to be informed whether installation was successful or not without having to go through a
different, low-level, API. See below for a comparison between the old and new APIs:
```lua
-- before
local handle = pkg:install()
handle:once("closed", function ()
    -- ...
end)

-- after
pkg:install({}, function (success, result)
    -- ...
end)
```

2 files changed, 30 insertions, 19 deletions

diff --git a/tests/fixtures/receipts/1.2.json b/tests/fixtures/receipts/1.2.json
deleted file mode 100644
index 75a14f09..00000000
--- a/tests/fixtures/receipts/1.2.json
+++ /dev/null
@@ -1,19 +0,0 @@
-{
-  "name": "angular-language-server",
-  "links": {
-    "bin": {
-      "ngserver": "node_modules/.bin/ngserver"
-    },
-    "opt": {},
-    "share": {}
-  },
-  "metrics": {
-    "completion_time": 1694752770559,
-    "start_time": 1694752764840
-  },
-  "schema_version": "1.2",
-  "source": {
-    "type": "registry+v1",
-    "id": "pkg:npm/%40angular/language-server@16.1.8"
-  }
-}
diff --git a/tests/fixtures/receipts/2.0.json b/tests/fixtures/receipts/2.0.json
new file mode 100644
index 00000000..b0c9e2f1
--- /dev/null
+++ b/tests/fixtures/receipts/2.0.json
@@ -0,0 +1,30 @@
+{
+  "links": {
+    "bin": {
+      "ngserver": "node_modules/.bin/ngserver"
+    },
+    "share": {},
+    "opt": {}
+  },
+  "name": "angular-language-server",
+  "schema_version": "2.0",
+  "metrics": {
+    "start_time": 1739692587948,
+    "completion_time": 1739692591360
+  },
+  "source": {
+    "id": "pkg:npm/%40angular/language-server@19.1.0",
+    "raw": {
+      "id": "pkg:npm/%40angular/language-server@19.1.0",
+      "extra_packages": [
+        "typescript@5.4.5"
+      ]
+    },
+    "type": "registry+v1"
+  },
+  "install_options": {
+    "debug": false,
+    "strict": false,
+    "force": false
+  }
+}