… the consumer when in KeyShared mode. (#109)

### Motivation
The pulsar python client lacks support for defining KeyShared behaviour like out of order message delivery and sticky-hash, auto-hash for consumers in KeyShared mode. This PR adds full support. The user can now provide a KeySharedPolicy when starting a consumer with client.subscribe() #47 

The ConsumerConfiguration::KeySharedPolicy and related setter/getter are now exposed to the Python client in this PR.

### Modifications

- Added pybind11 enum for KeySharedMode in src/enums.cc.
- Added pybind11 class for KeySharedPolicy in src/config.cc.
- Modified pybind11 class for ConsumerConfiguration and added function to set KeySharedPolicy and function to read KeySharedPolicy.
- Added KeySharedPolicy wrapper to pulsar/__init__.py. This wrapper handles KeySharedPolicy initialization and does some value validation.
- Added the key_shared_policy parameter to client.subscribe(), some validation, and adding to the config in pulsar/__init__.py.
- Added 4 new tests to test the new KeySharedPolicy functionality to tests/pulsar_test.py

…cess (#131)

### Motivation

#126 adds the
instruction to include the `_pulsar` C module when generating the API
docs. However, it does not work when the library is installed from
`pip`. It only works when the wheel is installed from `dist/*.whl` that
is generated by the `python3 setup.py bdist_wheel` command in the
README.

The reason is the official Python wheel uses `auditwheel` to package all
dynamic libraries, so the `_pulsar.so` depends on another dynamic
library in the relative path. e.g.

```bash
$ ldd ~/.local/lib/python3.8/site-packages/_pulsar.cpython-38-x86_64-linux-gnu.so
        libpulsar-b6dad138.so => /home/xyz/.local/lib/python3.8/site-packages/pulsar_client.libs/libpulsar-b6dad138.so (0x00007f8dc09b3000)
        ...
```

If we copy the `_pulsar.cpython-38-x86_64-linux-gnu.so` into the project
directory, the `libpulsar-b6dad138.so` will not be found.

### Modifications

In `RELEASE.md`, specify the path of `_pulsar.so` directly.

### Motivation

We need to link the Python shared library on non-Windows systems as
well. Otherwise, some link errors might happen.

### Motivation

Recently after the runner image was upgraded, the macOS build failed
with `symbol not found in flat namespace (_EVP_PKEY_get_bn_param)`.

See https://github.com/apache/pulsar-client-python/actions/runs/5805986979/job/15740588663?pr=134

There are actually two issues.

One is that when building the C++ client on macOS,
`/usr/local/opt/openssl/` will be firstly searched if `OPENSSL_ROOT_DIR`
is not defined.

https://github.com/apache/pulsar-client-cpp/blob/1e7d259bb94379ef6e4618fdac283912d0be6861/CMakeLists.txt#L136

It should be fixed at the C++ client side but we can also have a
workaround here by defining the `OPENSSL_ROOT_DIR` variable.

The other is that when building the libcurl, the headers from
`/usr/local/include/openssl/` were included, see the logs:

```
/usr/local/include/openssl/macros.h:193:49: note: expanded from macro 'OSSL_DEPRECATEDIN_3_0'
#   define OSSL_DEPRECATEDIN_3_0                OSSL_DEPRECATED(3.0)
```

It's a strange error because we have already configured the `--with-ssl`
option to specify the OpenSSL directory. I tried adding
`-I/path/to/my/openssl` to the `CFLAGS` env variable but it didn't work.

### Modifications

To resolve the 1st issue, specifying `OPENSSL_ROOT_DIR` to the
`DEPS_PREFIX` path when building the C++ client.

To resolve the 2nd issue, since I cannot find an elegant way to do that,
I just copied the OpenSSL headers from the dependency header directory
to the libcurl include directory.

### Modifications

Upgrade the C++ client to 3.3.0 and deprecate the `log_conf_file_path`
config due to apache/pulsar-client-cpp#283.

There is another issue that after
apache/pulsar-client-cpp#290, the CMakeLists.txt
from the C++ client finds the protobuf package with config mode. To fix
it, install the OpenSSL via CMake instead of the autotools.

Fixes #144

* feat: Support dead letter topic.

* Fix non space

* Let maxRedeliverCount param required.