[Tooling] Create build makefile (#390)

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## Description

This pr is responsible for both implementing targets to build the pocket binaries defined in the `app/` folder and for refactoring the help targets/comments used in the root makefile into cleaner and more readable commands.

The build targets also take in consideration the naming requirements for the binaries and allow them to be changed easily without having to change any package names.

## Issue

Fixes #366 

## Type of change

Please mark the relevant option(s):

- [x] New feature, functionality or library
- [ ] Bug fix
- [x] Code health or cleanup
- [ ] Major breaking change
- [ ] Documentation
- [ ] Other <!-- add details here if it a different type of change -->

## List of changes

<!-- List out all the changes made-->

- Splits root Makefile into multiple files
- Implements build targets to generate pocket binaries
- Refactor pocket help Makefile targets and comments

## Testing

- [x] `make develop_test`
- [x] [LocalNet](https://github.com/pokt-network/pocket/blob/main/docs/development/README.md) w/ all of the steps outlined in the `README`
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## Required Checklist

- [x] I have performed a self-review of my own code
- [x] I have commented my code, particularly in hard-to-understand areas
- [x] I have tested my changes using the available tooling
- [ ] I have updated the corresponding CHANGELOG

### If Applicable Checklist
- [ ] I have updated the corresponding README(s); local and/or global
- [ ] I have added tests that prove my fix is effective or that my feature works
- [ ] I have added, or updated, [mermaid.js](https://mermaid-js.github.io) diagrams in the corresponding README(s)
- [ ] I have added, or updated, documentation and [mermaid.js](https://mermaid-js.github.io) diagrams in `shared/docs/*` if I updated `shared/*`README(s)

Author: Gustavobelfort

.gitignore

@@ -60,4 +60,7 @@ rpc/server.gen.go
 rpc/client.gen.go
 
 # Ignored generated files by build/config/main.go
-build/config/gen*.json
+build/config/gen*.json
+
+# Ignored generated files by build
+bin/*