Support AllowReserved in Path

[lmazuel]

Support:

@route("/c1/here") op c1(@path(#{ allowReserved: true }) path: string): void;

to mean that the path parameter should be escaped (skip url encoding)

TypeSpec

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1. URI templates support microsoft/typespec#3736
   compiler:core deprecation design:accepted lib:http +4
   

Spec

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1. Support AllowReserved in Path Scenario tests cadl-ranch#665
   +0
2. Support AllowReserved in Path TCGC Author doc #1316
   docs lib:tcgc +2
   

Implementation

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1. Support AllowReserved in Path TCGC Implementation #1317
   lib:tcgc +1
   
2. Support AllowReserved in Path Implementation autorest.python#2754
   +0
   
3. Support AllowReserved in Path Implementation autorest.java#2896
   +0
   
4. Support AllowReserved in Path Implementation autorest.typescript#2734
   1 of 3
   HRLC RLC p0 +3
   
5. Support AllowReserved in Path Implementation autorest.csharp#4966
   DPG DPG/RLC v2.1 +2
   
6. Support AllowReserved in Path Implementation autorest.go#1422
   +0
   
7. https://github.com/Azure/autorest.cpp/issues/373
8. https://github.com/Azure/autorest.rust/issues/82

[tadelesh]

also this feature could cover the following uri template case:

@route("/{+scope}/action") op action(scope: string): void;