refactor: add core modules to libp2p (#400)

* refactor: add js-libp2p-connection-manager to repo

Co-authored-by: David Dias <daviddias.p@gmail.com>
Co-authored-by: Jacob Heun <jacobheun@gmail.com>
Co-authored-by: Pedro Teixeira <i@pgte.me>
Co-authored-by: Vasco Santos <vasco.santos@ua.pt>

* test(conn-mgr): only run in node

* refactor: add js-libp2p-identify to repo

Co-authored-by: David Dias <daviddias.p@gmail.com>
Co-authored-by: Friedel Ziegelmayer <dignifiedquire@gmail.com>
Co-authored-by: Hugo Dias <hugomrdias@gmail.com>
Co-authored-by: Jacob Heun <jacobheun@gmail.com>
Co-authored-by: Maciej Krüger <mkg20001@gmail.com>
Co-authored-by: Richard Littauer <richard.littauer@gmail.com>
Co-authored-by: Vasco Santos <vasco.santos@moxy.studio>
Co-authored-by: Yusef Napora <yusef@protocol.ai>
Co-authored-by: ᴠɪᴄᴛᴏʀ ʙᴊᴇʟᴋʜᴏʟᴍ <victorbjelkholm@gmail.com>

* refactor: add libp2p-pnet to repo

Co-authored-by: Jacob Heun <jacobheun@gmail.com>
Co-authored-by: Vasco Santos <vasco.santos@moxy.studio>

* refactor: add libp2p-ping to repo

Co-authored-by: David Dias <daviddias.p@gmail.com>
Co-authored-by: Francisco Baio Dias <xicombd@gmail.com>
Co-authored-by: Friedel Ziegelmayer <dignifiedquire@gmail.com>
Co-authored-by: Hugo Dias <mail@hugodias.me>
Co-authored-by: Jacob Heun <jacobheun@gmail.com>
Co-authored-by: João Antunes <j.goncalo.antunes@gmail.com>
Co-authored-by: Richard Littauer <richard.littauer@gmail.com>
Co-authored-by: Vasco Santos <vasco.santos@moxy.studio>
Co-authored-by: Vasco Santos <vasco.santos@ua.pt>
Co-authored-by: ᴠɪᴄᴛᴏʀ ʙᴊᴇʟᴋʜᴏʟᴍ <victorbjelkholm@gmail.com>

* refactor: add libp2p-circuit to repo

Co-authored-by: David Dias <daviddias.p@gmail.com>
Co-authored-by: Dmitriy Ryajov <dryajov@gmail.com>
Co-authored-by: Friedel Ziegelmayer <dignifiedquire@gmail.com>
Co-authored-by: Hugo Dias <mail@hugodias.me>
Co-authored-by: Jacob Heun <jacobheun@gmail.com>
Co-authored-by: Maciej Krüger <mkg20001@gmail.com>
Co-authored-by: Oli Evans <oli@tableflip.io>
Co-authored-by: Pedro Teixeira <i@pgte.me>
Co-authored-by: Vasco Santos <vasco.santos@ua.pt>
Co-authored-by: Victor Bjelkholm <victorbjelkholm@gmail.com>
Co-authored-by: Yusef Napora <yusef@napora.org>
Co-authored-by: dirkmc <dirk@mccormick.cx>

* test(switch): avoid using instanceof

* chore(switch): update bignumber dep

* refactor(circuit): clean up tests

* refactor(switch): consolidate get peer utils

* test(identify): do deep checks of addresses

* test(identify): bump timeout for identify test

* test(switch): tidy up limit dialer test

* refactor(switch): remove redundant circuit tests

* chore: add coverage script

* refactor(circuit): consolidate get peer info

* docs: reference original repositories in each sub readme

* docs: fix comment

* refactor: clean up sub package.json files and readmes

examples/pnet-ipfs/README.md

@@ -0,0 +1,29 @@
+# Private Networking with IPFS
+This example shows how to set up a private network of IPFS nodes.
+
+## Setup
+Install dependencies:
+
+```
+npm install
+```
+
+## Run
+Running the example will cause two nodes with the same swarm key to be started and exchange basic information.
+
+```
+node index.js
+```
+
+### Using different keys
+This example includes `TASK` comments that can be used to try the example with different swarm keys. This will
+allow you to see how nodes will fail to connect if they are on different private networks and try to connect to
+one another.
+
+To change the swarm key of one of the nodes, look through `index.js` for comments starting with `TASK` to indicate
+where lines are that pertain to changing the swarm key of node 2.
+
+### Exploring the repos
+Once you've run the example you can take a look at the repos in the `./tmp` directory to see how they differ, including
+the swarm keys. You should see a `swarm.key` file in each of the repos and when the nodes are on the same private network
+this contents of the `swarm.key` files should be the same.