Add optional Mailozaurr email transport

[PrzemyslawKlys]

Summary

Lets the existing Email DSL send through Mailozaurr without adding a required module dependency.

• adds Email -UseMailozaurr
• adds -MailozaurrParameters for provider authentication, retry, and transport options
• resolves only Mailozaurr's Send-EmailMessage command when requested
• maps the legacy SMTP envelope while preserving Graph, MgGraphRequest, SendGrid, and EmailProvider parameter sets
• keeps the complete SMTP-only transport, authentication, certificate, delivery, timeout, and OAuth alias surface out of non-SMTP provider splats
• treats null and disabled authentication switches as inactive while preserving explicit false overrides
• lets explicit SMTP authentication replace unsupported legacy password-file behavior
• preserves legacy default-credential and secure-password behavior when no replacement is supplied
• preserves the historical -OutputHTML contract: output the rendered HTML and continue sending

Example

Email -UseMailozaurr `
    -From reports@example.com `
    -To operations@example.com `
    -MailozaurrParameters @{
        Graph      = $true
        Credential = $credential
    } {
        New-HTMLText -Text 'Daily report'
    }

Mailozaurr remains optional and is discovered at runtime. EvotecIT/Mailozaurr#648 adds the complementary transport-neutral rendered-content contract but is not a dependency of this PR.

Validation

• focused email transport contract: 24 passed in PowerShell 7
• focused email transport contract: 24 passed in Windows PowerShell 5.1
• coverage includes provider selection, complete SMTP transport filtering, OAuth aliases, case-sensitive dictionaries, inactive values, legacy override behavior, command provenance, and -OutputHTML compatibility

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