linera-faucet-client: remove anyhow (#3365)

## Motivation

`anyhow::Error` doesn't implement `std::error::Error`, and therefore
can't be converted to a JavaScript error (`wasm_bindgen::JsError`).

## Proposal

Give `linera-faucet-client` a dedicated error type, with help from
`thiserror` and `thiserror-context`.

## Test Plan

Refactor: should be tested by CI.

## Release Plan

- Nothing to do / These changes follow the usual release cycle.

## Links

- [reviewer
checklist](https://github.com/linera-io/linera-protocol/blob/main/CONTRIBUTING.md#reviewer-checklist)

Cargo.toml

@@ -51,9 +51,6 @@ async-trait = "0.1.77"
 async-tungstenite = { version = "0.22", features = ["tokio-runtime"] }
 aws-config = "1.1.7"
 aws-sdk-dynamodb = "1.60.0"
-aws-sdk-s3 = "1.17.0"
-aws-smithy-http = "0.60.6"
-aws-types = "1.1.7"
 aws-smithy-types = "1.1.7"
 axum = "0.7.4"
 base64 = "0.22.0"
@@ -98,7 +95,6 @@ hex = "0.4.3"
 http = "1.1.0"
 humantime = "2.1.0"
 glob = "0.3.1"
-gloo-storage = "0.3.0"
 gloo-utils = "0.2.0"
 indexed_db_futures = "0.4.1"
 insta = "1.36.1"
@@ -200,7 +196,6 @@ wasmtime = { version = "25.0.0", default-features = false, features = [
     "std",
 ] }
 wasmtimer = "0.2.0"
-webassembly-test = "0.1.0"
 web-sys = "0.3.69"
 js-sys = "0.3.70"
 web-time = "1.1.0"
@@ -228,7 +223,6 @@ linera-views = { version = "0.14.0", path = "./linera-views", default-features =
 linera-views-derive = { version = "0.14.0", path = "./linera-views-derive" }
 linera-witty = { version = "0.14.0", path = "./linera-witty" }
 linera-witty-macros = { version = "0.14.0", path = "./linera-witty-macros" }
-linera-witty-test-modules = { version = "0.14.0", path = "./linera-witty/test-modules" }
 linera-sdk-derive = { version = "0.14.0", path = "./linera-sdk-derive" }
 linera-service = { version = "0.14.0", path = "./linera-service", default-features = false }
 linera-service-graphql-client = { version = "0.14.0", path = "./linera-service-graphql-client" }

linera-faucet/Cargo.toml

@@ -9,6 +9,8 @@ edition.workspace = true
 
 [dependencies]
 linera-base.workspace = true
+serde.workspace = true
+serde_with = "3.12.0"
 
 [dependencies.async-graphql]
 workspace = true

linera-faucet/client/Cargo.toml

@@ -8,10 +8,12 @@ license.workspace = true
 edition.workspace = true
 
 [dependencies]
-anyhow.workspace = true
 linera-base.workspace = true
 linera-client.workspace = true
 linera-faucet = { version = "0.14.0", path = ".." }
 linera-version.workspace = true
 reqwest.workspace = true
+serde.workspace = true
 serde_json.workspace = true
+thiserror.workspace = true
+thiserror-context.workspace = true