Fix namespace / folder mismatches

Nobody has claimed this yet.

We currently have classes in the following namespaces where the namespace of the class does not correspond with its file location (folder):

Renci.SshNet.Security
Renci.SshNet.Sftp.Requests
Renci.SshNet.Sftp.Responses
Renci.SshNet.Messages.Connection

These inconsistencies result in IDE0130 being reported.

To resolve this, we have two options:

Change the namespace of the class to correspond with its file location.
When the class is public, this is a breaking changes.
Move the file to the folder that corresponds with its namespace.
This is a non-breaking change.

Even though the first option is a breaking change in case of public class, I'd still at least consider this option for some classes.

Here's a breakdown by namespace:

Renci.SshNet.Security:

Class	Accessibility	Folder	Proposal
DsaKey	public	Security/Cryptography/	Change namespace
Key	public	Security/Cryptography/	Change namespace
EcdsaKey	public	Security/Cryptography/	Change namespace
ED25519Key	public	Security/Cryptography/	Change namespace
RsaKey	public	Security/Cryptography/	Change namespace

Renci.SshNet.Sftp.Requests:

Class	Accessibility	Folder	Proposal
FStatVfsRequest	internal	Sftp\Requests\ExtendedRequests	Move file
HardLinkRequest	internal	Sftp\Requests\ExtendedRequests	Move file
PosixRenameRequest	internal	Sftp\Requests\ExtendedRequests	Move file
StatVfsRequest	internal	Sftp\Requests\ExtendedRequests	Move file

Renci.SshNet.Sftp.Responses:

Class	Accessibility	Folder	Proposal
ExtendedReplyInfo	internal	Sftp\Responses\ExtendedReplies\ExtendedReplyInfo	Move file
StatVfsReplyInfo	internal	Sftp\Responses\ExtendedReplies\ExtendedReplyInfo	Move file

Class	Accessibility	Folder	Proposal
ExtendedReplyInfo	internal	Sftp\Requests\ExtendedRequests	Move file
HardLinkRequest	internal	Sftp\Requests\ExtendedRequests	Move file
PosixRenameRequest	internal	Sftp\Requests\ExtendedRequests	Move file
StatVfsRequest	internal	Sftp\Requests\ExtendedRequests	Move file

Renci.SshNet.Messages.Connection:

Class	Accessibility	Folder	Proposal
BreakRequestInfo	internal	Messages/Connection/ChannelRequest	Move file
ChannelRequestMessage	public	Messages/Connection/ChannelRequest	Move file
EndOfWriteRequestInfo	public	Messages/Connection/ChannelRequest	Move file
EnvironmentVariableRequestInfo	internal	Messages/Connection/ChannelRequest	Move file
ExecRequestInfo	internal	Messages/Connection/ChannelRequest	Move file
ExitSignalRequestInfo	internal	Messages/Connection/ChannelRequest	Move file
ExitStatusRequestInfo	internal	Messages/Connection/ChannelRequest	Move file
KeepAliveRequestInfo	public	Messages/Connection/ChannelRequest	Move file
PseudoTerminalRequestInfo	internal	Messages/Connection/ChannelRequest	Move file
RequestInfo	public	Messages/Connection/ChannelRequest	Move file
ShellRequestInfo	internal	Messages/Connection/ChannelRequest	Move file
SignalRequestInfo	internal	Messages/Connection/ChannelRequest	Move file
SubsystemRequestInfo	internal	Messages/Connection/ChannelRequest	Move file
WindowChangeRequestInfo	internal	Messages/Connection/ChannelRequest	Move file
X11ForwardingRequestInfo	internal	Messages/Connection/ChannelRequest	Move file
XonXoffRequestInfo	internal	Messages/Connection/ChannelRequest	Move file
ChannelOpenInfo	public	Messages/Connection/ChannelOpen	Move file
ChannelOpenMessage	public	Messages/Connection/ChannelOpen	Move file
DirectTcpipChannelInfo	internal	Messages/Connection/ChannelOpen	Move file
ForwardedTcpipChannelInfo	internal	Messages/Connection/ChannelOpen	Move file
SessionChannelOpenInfo	internal	Messages/Connection/ChannelOpen	Move file
X11ChannelOpenInfo	internal	Messages/Connection/ChannelOpen	Move file

Review the listed classes in Security/Cryptography, Sftp/Requests/ExtendedRequests, Sftp/Responses/ExtendedReplies/ExtendedReplyInfo, and Messages/Connection/ChannelRequest or ChannelOpen, comparing each namespace with its folder. Resolve the public-class cases with the stated breaking-change concern in mind, then verify IDE0130 is no longer reported and the project still builds.

Written by the indexing model from the issue text.

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