feat(Clientlib): separate client encryption and server computation

Resolve #200

docs/cpp_api/clientlib.rst

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+ClientLib
+=========
+
+.. toctree::
+   clientlib/intro
+   clientlib/client_lambda
+   clientlib/server_lambda
+
+
+Index
+=====
+.. toctree::
+   :glob:
+   :maxdepth: 2
+
+   clientlib/*

docs/cpp_api/clientlib/arguments.rst

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+LambdaArgument:
+===============
+
+.. doxygenfile:: Arguments.h

docs/cpp_api/clientlib/client_example.cpp

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+#include <concretelang/ClientLib/ClientLambda.h>
+
+// Include the header that has been generated by the compiler
+#include "myinclude/fhe_service/additions.h"
+
+void query_server(MyConnection conn) {
+    auto libPath = "/opt/fhe_service/libs/additions.so";
+    std::ostream to_server = conn.ostream();
+    std::ostream from_server = conn.istream();
+    // In a real code only load once.
+    auto add2int = additions::add2int::load(libPath, seed_msb, seed_lsb);
+    auto err = add2int->callSerialize(1, 2, to_server);
+    if( err ) { throw MyException() };
+    auto result = add2int->decryptReturned(from_server);
+    assert(result == 3);
+}

docs/cpp_api/clientlib/client_lambda.rst

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+ClientLambda:
+===============
+
+.. doxygenfile:: ClientLambda.h
+    :sections: briefdescription innernamespace typedef innerclass public-static-func public-func

docs/cpp_api/clientlib/client_parameters.rst

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+ClientParameters:
+===============
+
+.. doxygenstruct:: mlir::concretelang::ClientParameters
+.. doxygenfile:: ClientParameters.h

docs/cpp_api/clientlib/intro.rst

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+Description
+========
+
+ClientLambda represents a FHE function on the client side.
+ServerLambda represents a FHE function on the server side.
+
+These object read/write on istreams/ostreams.
+
+Implementing a client/server consists in connecting the two, by connecting to actual streams.
+
+Example on client side:
+
+.. literalinclude:: client_example.cpp
+    :linenos:
+    :language: bash
+..
+  For some reason cpp does not work well here.
+
+Example on server side:
+
+.. literalinclude:: server_example.cpp
+    :linenos:
+    :language: bash

docs/cpp_api/clientlib/server_example.cpp

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+#include <concretelang/ServerLib/ServerLambda.h>
+
+void answer_client(MyConnection conn) {
+    std::istream from_client = conn.istream();
+    std::ostream to_client = conn.ostream();
+    auto err = serverLambda.read_call_write(serverInput, serverOutput);
+    if (err) {
+        throw MyException();
+    }
+}

docs/cpp_api/clientlib/server_lambda.rst

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+ServerLambda:
+===============
+
+.. doxygenfile:: ServerLambda.h

docs/cpp_api/support/client_parameters.rst

@@ -1,4 +0,0 @@
-ClientParameters:
-===============
-
-.. doxygenfile:: ClientParameters.h