Allow : and @ unescaped in URL path and query

[QuinnHarris]

RFC 3986 explicitly allows both : and @ to appear unescaped in URL path segments and query strings (pchar):

pchar = unreserved / pct-encoded / sub-delims / ":" / "@"

However, zio-http currently percent-encodes these characters even when they appear in contexts where they are treated as data rather than delimiters.

This PR updates URL rendering to allow : and @ to remain unescaped in path and query segments both using the encodeComponentInto function.

I specifically required this change when using google validateAddress API with URL https://addressvalidation.googleapis.com/v1:validateAddress that does not work when it is percent-encoded.

References

• RFC 3986 §3.3 (Path)
• RFC 3986 §3.4 (Query)

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[987Nabil]

@QuinnHarris please fix this

[error] /home/runner/work/zio-http/zio-http/zio-http/jvm/src/test/scala/zio/http/URLSpec.scala:165:24: type mismatch;
[error]  found   : Option[zio.http.URL.Fragment]
[error]  required: Option[a.Fragment]
[error]             assertTrue(URL(path = path).encode == path.encode)
[error]                        ^
[error] /home/runner/work/zio-http/zio-http/zio-http/jvm/src/test/scala/zio/http/URLSpec.scala:165:23: not found: value location
[error]             assertTrue(URL(path = path).encode == path.encode)
[error]                       ^