Separation of concerns: grammar for URL components instead of whole URLs

[ralfhandl]

We have published ABNF rules for OData request URLs

• odataUri
• odataRelativeUri
• resourcePath
• queryOptions

which are much complicated by the fact that they are defined for percent-encoded URLs. Because of ODATA-1583, much of these rules must be duplicated for the context rule, which (being a URL fragment) needs different percent-encoding.

It would be much easier if we assume that the "raw" URL has already been split and percent-decoded in compliance with the WHATWG URL Standard and provide grammars for the components of a URL:

• path
• search parameter name
• search parameter value
• fragment

Consider writing an alternative set of grammars with this approach.

Imported from ODATA-1606