Switch indexeddb backend to sqlite and improve IPC messaging (#38187)

- Use sqlite instead of heed. (one indexed database = one sqlite
database)
- Implement the backend for indexes
- Use keyranges where needed (as specified by the spec)
- Implement `getKey`
- Fix channel error messaging (led to a bunch of changes to how async
requests are handled)

Note: `components/net/indexeddb/engines/sqlite/serialize.rs` is unused;
I can delete it if needed.

Testing: Switching to sqlite eliminated many panics (exposing some new
failures).
Fixes: #38040

---------

Signed-off-by: Ashwin Naren <arihant2math@gmail.com>

components/net/Cargo.toml

@@ -36,7 +36,6 @@ futures-core = { version = "0.3.30", default-features = false }
 futures-util = { version = "0.3.30", default-features = false }
 generic-array = "0.14"
 headers = { workspace = true }
-heed = "0.20"
 http = { workspace = true }
 http-body-util = { workspace = true }
 hyper = { workspace = true, features = ["client", "http1", "http2"] }
@@ -60,6 +59,8 @@ rustls = { workspace = true }
 rustls-pemfile = { workspace = true }
 rustls-pki-types = { workspace = true }
 resvg = { workspace = true }
+rusqlite = { version = "0.37", features = ["bundled"] }
+sea-query = { version = "0.32", default-features = false, features = ["derive", "backend-sqlite"] }
 serde = { workspace = true }
 serde_json = { workspace = true }
 servo_arc = { workspace = true }
@@ -86,6 +87,7 @@ futures = { version = "0.3", features = ["compat"] }
 hyper = { workspace = true, features = ["full"] }
 hyper-util = { workspace = true, features = ["server-graceful"] }
 rustls = { workspace = true, features = ["aws-lc-rs"] }
+tempfile = "3"
 
 [[test]]
 name = "main"