Move InvocationMode and TcpServerAddressBody to IceRpc::Ice::Internal

[bernardnormier]

This PR moves these .ice files to IceRpc/Ice/Internal and removes IceRpc/Slice.

[Copilot]

Pull request overview

Moves internal Ice-related Slice definitions into the IceRpc::Ice::Internal module/namespace, aligning file placement with the IceRpc/Ice/Internal directory and removing the prior IceRpc::Slice::Internal module naming.

Changes:

• Updated TcpServerAddressBody and InvocationMode module declarations from IceRpc::Slice::Internal to IceRpc::Ice::Internal.
• Tweaked doc comments to reflect “Ice proxy” wording.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
IceRpc/Ice/Internal/TcpServerAddressBody.ice	Renames module to IceRpc::Ice::Internal and updates wording in the struct doc comment.
IceRpc/Ice/Internal/InvocationMode.ice	Renames module to IceRpc::Ice::Internal and updates wording in the enum doc comment.

Comments suppressed due to low confidence (1)

IceRpc/Ice/Internal/TcpServerAddressBody.ice:5

• Doc comment uses lowercase protocol acronyms ("tcp"/"ssl"); consider capitalizing to "TCP"/"SSL" for consistency and readability.

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