feat: introduce Std.Internal.SSL.Context

[algebraic-dev]

This PR adds the Context type for managing SSL_CTX on the Lean side.

[mathlib-lean-pr-testing]

Mathlib CI status (docs):

• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase 9566c798d09abdf266a00eae67a9b1188c6df36e --onto 659e8bb858995b0a1ada239c5b3819c8f8f2772f. You can force Mathlib CI using the force-mathlib-ci label. (2026-06-16 05:05:27)
• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase 9566c798d09abdf266a00eae67a9b1188c6df36e --onto 24c48fe0fdbf4bca5b6f907e638732c871dcd2db. You can force Mathlib CI using the force-mathlib-ci label. (2026-06-16 10:36:03)
• ❗ Batteries/Mathlib CI will not be attempted unless your PR branches off the nightly-with-mathlib branch. Try git rebase 9566c798d09abdf266a00eae67a9b1188c6df36e --onto 4792cd22887c8b529a351f6563b693426ff2a8f8. You can force Mathlib CI using the force-mathlib-ci label. (2026-06-18 10:24:23)

[leanprover-bot]

Reference manual CI status:

• ❗ Reference manual CI will not be attempted unless your PR branches off the nightly-with-manual branch. Try git rebase 9566c798d09abdf266a00eae67a9b1188c6df36e --onto 803553a556fd82fa1060efb0c43eda542130cb16. You can force reference manual CI using the force-manual-ci label. (2026-06-16 05:05:29)