Multi-Value headers support for PHP Generation

[SilasKenneth]

• [PHP] Support for Multi-Value Headers.
• Add changelog entry.

Abstraction changes

• Support for multi-value headers. kiota-abstractions-php#26

Generation changes.

• PHP Multi-Value header support. kiota-samples#1529

[Ndiritu]

I think this pattern increases the effort to configure headers on a request (at least for PHP)

Using the request config object, devs have an extra step to instantiate a RequestHeaders object vs using a more familiar PSR header format/pattern

For devs manipulating the request information object directly, we could add a setter instead of publicly exposing the headers property to append values to existing headers.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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