Add support for backtick strings in predicates values.

We are now able to support this code:

```
GET http://foo.com
HTTP 200
[Asserts]
xpath "string(//title)" == `Bob says: "Hi"`
```

integration/hurl/tests_ok/assert_json.hurl

@@ -30,6 +30,8 @@ jsonpath "$.failures" count == 1
 jsonpath "$.failures" isCollection
 jsonpath "$.warnings" count == 0
 jsonpath "$.warnings" isEmpty
+jsonpath "$.message" == "Bob says \"Hello\""
+jsonpath "$.message" == `Bob says "Hello"`
 jsonpath "$.toto" not exists
 jsonpath "$.failures" exists
 jsonpath "$.warnings" exists
@@ -62,7 +64,7 @@ jsonpath "$.profile-id" == "123abc"
 jsonpath "$['profile-id']" == "123abc"
 jsonpath "$.errors[0]" not isEmpty
 jsonpath "$.empty" isEmpty
-jsonpath "$.*" count == 11
+jsonpath "$.*" count == 12
 jsonpath "$.errors..*" count == 4
 jsonpath "$..id" count == 3
 jsonpath "$.dates[0]" isIsoDate
@@ -79,6 +81,7 @@ jsonpath "$.tags[0]" not isNumber
   "errors": [{"id":"error1"},{"id":"error2"}],
   "failures": [{"id":"failure1"}],
   "warnings": [],
+  "message": "Bob says \"Hello\"",
   "duration": 1.5,
   "tags": ["test"],
   "nullable": null,
@@ -101,6 +104,7 @@ GET http://localhost:8000/assert-json
 HTTP 200
 [Asserts]
 jsonpath "$.errors[{{index}}].id" == "error2"
+jsonpath "$.errors[{{index}}].id" == `error2`
 jsonpath "$.tags" includes "test"
 jsonpath "$.tags" not includes "prod"
 jsonpath "$.tags" not includes null

integration/hurl/tests_ok/assert_json.py

@@ -11,6 +11,7 @@ def assert_json():
   "errors": [{"id":"error1"},{"id":"error2"}],
   "failures": [{"id":"failure1"}],
   "warnings": [],
+  "message": "Bob says \\"Hello\\"",
   "duration": 1.5,
   "tags": ["test"],
   "nullable": null,

integration/hurl/tests_ok/json_output.out.pattern

@@ -1 +1 @@
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+{"cookies":[{"domain":"localhost","expires":"<<<\d+>>>","https":"FALSE","include_subdomain":"FALSE","name":"cookie2","path":"/","value":"valueA"}],"entries":[{"asserts":[{"line":7,"success":true},{"line":7,"success":true},{"line":8,"success":true}],"calls":[{"request":{"cookies":[],"headers":[{"name":"Host","value":"localhost:8000"},{"name":"Accept","value":"*/*"},{"name":"User-Agent","value":"hurl/<<<.*?>>>"}],"method":"GET","query_string":[],"url":"http://localhost:8000/hello"},"response":{"cookies":[],"headers":[{"name":"Server","value":"Werkzeug/<<<.*?>>> Python/<<<.*?>>>"},{"name":"Date","value":"<<<.*?>>>"},{"name":"Content-Type","value":"text/html; charset=utf-8"},{"name":"Content-Length","value":"12"},{"name":"Server","value":"Flask Server"},{"name":"Connection","value":"close"}],"http_version":"HTTP/1.1","status":200},"timings":{"app_connect":<<<\d+>>>,"begin_call":"<<<.*?>>>","connect":<<<\d+>>>,"end_call":"<<<.*?>>>","name_lookup":<<<\d+>>>,"pre_transfer":<<<\d+>>>,"start_transfer":<<<\d+>>>,"total":<<<\d+>>>}}],"captures":[],"index":1,"line":6,"time":<<<\d+>>>},{"asserts":[{"line":13,"success":true},{"line":13,"success":true},{"line":15,"success":true}],"calls":[{"request":{"cookies":[],"headers":[{"name":"Host","value":"localhost:8000"},{"name":"Accept","value":"*/*"},{"name":"User-Agent","value":"hurl/<<<.*?>>>"}],"method":"GET","query_string":[],"url":"http://localhost:8000/cookies/set-session-cookie2-valueA"},"response":{"cookies":[{"name":"cookie2","path":"/","value":"valueA"}],"headers":[{"name":"Server","value":"Werkzeug/<<<.*?>>> Python/<<<.*?>>>"},{"name":"Date","value":"<<<.*?>>>"},{"name":"Content-Type","value":"text/html; 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integration/hurl/tests_ok/json_output.ps1

@@ -1,3 +1,3 @@
 Set-StrictMode -Version latest
 $ErrorActionPreference = 'Stop'
-hurl --json --verbose tests_ok/json_output.hurl
+hurl --json tests_ok/json_output.hurl

integration/hurl/tests_ok/json_output.sh

@@ -1,3 +1,3 @@
 #!/bin/bash
 set -Eeuo pipefail
-hurl --json --verbose tests_ok/json_output.hurl
+hurl --json tests_ok/json_output.hurl

packages/hurl_core/src/parser/predicate_value.rs

@@ -63,6 +63,10 @@ pub fn predicate_value(reader: &mut Reader) -> ParseResult<PredicateValue> {
                 Ok(value) => Ok(PredicateValue::MultilineString(value)),
                 Err(e) => Err(e),
             },
+            |p1| match backtick_template(p1) {
+                Ok(value) => Ok(PredicateValue::String(value)),
+                Err(e) => Err(e),
+            },
             |p1| match regex(p1) {
                 Ok(value) => Ok(PredicateValue::Regex(value)),
                 Err(e) => Err(e),