Make rcu_thread_key context-aware

Currently, rcu has a global bit of data, the CRYPTO_THREAD_LOCAL object
to store per thread data. This works in some cases, but fails in FIPS,
becu

Make rcu_thread_key context-aware

Currently, rcu has a global bit of data, the CRYPTO_THREAD_LOCAL object
to store per thread data. This works in some cases, but fails in FIPS,
becuase it contains its own copy of the global key.

So
1) Make the rcu_thr_key a per-context variable, and force
ossl_rcu_lock_new to be context aware

2) Store a pointer to the context in the lock object

3) Use the context to get the global thread key on read/write lock

4) Use ossl_thread_start_init to properly register a cleanup on thread
exit

5) Fix up missed calls to OSSL_thread_stop() in our tests

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24162)

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Copyright year updates

Reviewed-by: Neil Horman <nhorman@openssl.org>
Release: yes
(cherry picked from commit 0ce7d1f355c1240653e320a3f6f8109c1f05f8c0)

Reviewed-by: Hugo Lan

Copyright year updates

Reviewed-by: Neil Horman <nhorman@openssl.org>
Release: yes
(cherry picked from commit 0ce7d1f355c1240653e320a3f6f8109c1f05f8c0)

Reviewed-by: Hugo Landau <hlandau@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/24034)

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RCU lock implementation

Introduce an RCU lock implementation as an alternative locking mechanism
to openssl. The api is documented in the ossl_rcu.pod
file

Read side implem

RCU lock implementation

Introduce an RCU lock implementation as an alternative locking mechanism
to openssl. The api is documented in the ossl_rcu.pod
file

Read side implementaiton is comparable to that of RWLOCKS:
ossl_rcu_read_lock(lock);
<
critical section in which data can be accessed via
ossl_derefrence
>
ossl_rcu_read_unlock(lock);

Write side implementation is:
ossl_rcu_write_lock(lock);
<
critical section in which data can be updated via
ossl_assign_pointer
and stale data can optionally be scheduled for removal
via ossl_rcu_call
>
ossl_rcu_write_unlock(lock);
...
ossl_synchronize_rcu(lock);

ossl_rcu_call fixup

Reviewed-by: Hugo Landau <hlandau@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22729)

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