Use HTTP Semantics for accept option

[msporny]

This PR is an attempt to address issue #116 by modelling the value of the accept option according to RFC9110 (HTTP Semantics).

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[dmitrizagidulin]

👍 looks good, just needs resolving rebase conflict.

[TallTed]

Suggested change

	The media type of the caller's preferred <a>representation</a> of the
	<a>DID document</a>. The value MUST be expressed according to the
	`Accept` header value as defined in [[[RFC9110]]], <a
	data-cite="RFC9110#section-12.5.1">Section 12.5.1</a>. The <a>DID
	resolver</a> implementation SHOULD use this value to determine the
	<a>representation</a> of the returned
	<code>didDocument</code> if such a <a>representation</a> is supported
	and available. This property is OPTIONAL.
	The media type of the caller's preferred <a>representation</a> of the
	<a>DID document</a>. The value MUST be expressed according to the
	`Accept` header value definition in [[[RFC9110]]], <a
	data-cite="RFC9110#section-12.5.1">Section 12.5.1</a>. The <a>DID
	resolver</a> implementation SHOULD use this value to determine the
	<a>representation</a> of the returned
	<code>didDocument</code> if such a <a>representation</a> is supported
	and available. This property is OPTIONAL.

[TallTed]

Suggested change

	The media type that the caller prefers for <code>contentStream</code>.
	The value MUST be expressed according to the `Accept` header value as
	defined in [[[RFC9110]]], <a data-cite="RFC9110#section-12.5.1">Section
	12.5.1</a>. The <a>DID URL dereferencer</a> implementation SHOULD use
	this value to determine the <code>contentType</code> of the
	<a>representation</a> contained in the returned value if such a
	<a>representation</a> is supported and available.
	The media type that the caller prefers for <code>contentStream</code>.
	The value MUST be expressed according to the `Accept` header value
	definition in [[[RFC9110]]], <a data-cite="RFC9110#section-12.5.1">Section
	12.5.1</a>. The <a>DID URL dereferencer</a> implementation SHOULD use
	this value to determine the <code>contentType</code> of the
	<a>representation</a> contained in the returned value if such a
	<a>representation</a> is supported and available.