Move BouncyCastle implementation of hpke to an extra module (#20)

Motivation:

We should not depend on BouncyCastle in our OHTTP implementation as its an implementation detail and alterantive implementations will be added.

Modifications:

Move Bouncycastle implementation to extra module and only depend on it for tests.

Result:

No bouncycastle dependency for ohttp codec

codec-ohttp-hpke-bouncycastle/pom.xml

@@ -0,0 +1,90 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Copyright 2023 The Netty Project
+  ~
+  ~ The Netty Project licenses this file to you under the Apache License,
+  ~ version 2.0 (the "License"); you may not use this file except in compliance
+  ~ with the License. You may obtain a copy of the License at:
+  ~
+  ~   https://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+  ~ WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+  ~ License for the specific language governing permissions and limitations
+  ~ under the License.
+  -->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/maven-v4_0_0.xsd">
+<modelVersion>4.0.0</modelVersion>
+<parent>
+    <groupId>io.netty.incubator</groupId>
+    <artifactId>netty-incubator-codec-parent-ohttp</artifactId>
+    <version>0.0.3.Final-SNAPSHOT</version>
+</parent>
+
+<artifactId>netty-incubator-codec-ohttp-hpke-bouncycastle</artifactId>
+<version>0.0.3.Final-SNAPSHOT</version>
+<name>Netty/Incubator/Codec/OHTTP/HPKE/BouncyCastle</name>
+<packaging>jar</packaging>
+
+<properties>
+    <javaModuleName>io.netty.incubator.codec.ohttp.hpke.bouncycastle</javaModuleName>
+</properties>
+
+<build>
+    <plugins>
+        <plugin>
+            <artifactId>maven-jar-plugin</artifactId>
+            <version>3.2.0</version>
+            <executions>
+                <execution>
+                    <id>default-jar</id>
+                    <configuration>
+                        <archive>
+                            <manifest>
+                                <addDefaultImplementationEntries>true</addDefaultImplementationEntries>
+                            </manifest>
+                            <manifestEntries>
+                                <Automatic-Module-Name>${javaModuleName}</Automatic-Module-Name>
+                            </manifestEntries>
+                            <index>true</index>
+                            <manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>
+                        </archive>
+                    </configuration>
+                </execution>
+            </executions>
+        </plugin>
+    </plugins>
+</build>
+
+<dependencies>
+    <dependency>
+        <groupId>io.netty.incubator</groupId>
+        <artifactId>netty-incubator-codec-ohttp-hpke</artifactId>
+        <version>${project.version}</version>
+    </dependency>
+    <dependency>
+        <groupId>io.netty</groupId>
+        <artifactId>netty-buffer</artifactId>
+    </dependency>
+    <dependency>
+        <groupId>org.bouncycastle</groupId>
+        <artifactId>bcpkix-jdk18on</artifactId>
+    </dependency>
+    <dependency>
+        <groupId>org.junit.jupiter</groupId>
+        <artifactId>junit-jupiter-api</artifactId>
+        <scope>test</scope>
+    </dependency>
+    <dependency>
+        <groupId>org.junit.jupiter</groupId>
+        <artifactId>junit-jupiter-engine</artifactId>
+        <scope>test</scope>
+    </dependency>
+    <dependency>
+        <groupId>org.junit.jupiter</groupId>
+        <artifactId>junit-jupiter-params</artifactId>
+        <scope>test</scope>
+    </dependency>
+</dependencies>
+</project>

codec-ohttp/pom.xml

@@ -103,5 +103,11 @@
       <artifactId>junit-jupiter-params</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>io.netty.incubator</groupId>
+      <artifactId>netty-incubator-codec-ohttp-hpke-bouncycastle</artifactId>
+      <version>${project.version}</version>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 </project>

pom.xml

@@ -69,6 +69,7 @@
     <module>codec-ohttp</module>
     <module>codec-bhttp</module>
     <module>codec-ohttp-hpke</module>
+    <module>codec-ohttp-hpke-bouncycastle</module>
   </modules>
   <properties>
     <javaModuleName />