Add telemetry for supermaven (#11821)

Data migration plan:

- [X] Make a duplicate table of `copilot_events`
    - Name: `inline_completion_events`
    - Omit `suggestion_id` column
- [X-reverted-skipping] In collab, continue to match on copilot_events,
but simply stuff their data into inline_completion_events, to forward it
to the new table
- [skipping] Once collab is deployed, ensure no events are being sent to
copilot_events, migrate `copilot_events` to new table via a transaction
- [skipping] Delete `copilot_events` table

---

- [X] Locally test that copilot events sent from old clients get put
into inline_completions_table
- [X] Locally test that copilot events and supermaven events sent from
new clients get put into inline_completions_table

---

- [X] Why are discard events being spammed?
- A:
8d4315712b/crates/editor/src/editor.rs (L2147)


![scr-20240514-pqmg](https://github.com/zed-industries/zed/assets/19867440/e51e7ae4-21b8-47a2-bfaa-f68fb355e409)

This will throw off the past results for accepted / dismissed that I was
wanting to use to evaluate Supermaven quality, by comparing its rate
with copilot's rate.

I'm not super thrilled with this fix, but I think it'll do. In the
`supermaven_completions_provider`, we check if there's a `completion_id`
before sending either an accepted or discard completion event. I don't
see a similar construct in the `copilot_completions_provider` to
piggyback off of, so I begrudgingly introduced
`should_allow_event_to_send` and had it follow the same pattern that
`completion_id` does. Maybe there's a better way?

---

Adds events to supermaven suggestions. Makes "CopilotEvents" generic ->
"InlineCompletionEvents".

Release Notes:

- N/A

crates/language_tools/src/lsp_log.rs

@@ -129,9 +129,8 @@ impl LogStore {
 
         let copilot_subscription = Copilot::global(cx).map(|copilot| {
             let copilot = &copilot;
-            cx.subscribe(
-                copilot,
-                |this, copilot, copilot_event, cx| match copilot_event {
+            cx.subscribe(copilot, |this, copilot, inline_completion_event, cx| {
+                match inline_completion_event {
                     copilot::Event::CopilotLanguageServerStarted => {
                         if let Some(server) = copilot.read(cx).language_server() {
                             let server_id = server.server_id();
@@ -159,8 +158,8 @@ impl LogStore {
                             );
                         }
                     }
-                },
-            )
+                }
+            })
         });
 
         let this = Self {