feat: Shared Plugin RPC Host

[joshLong145]

• Adds functionality to allow plugins to share a host if executing in the same context (loaded from the same configuration)
• New plugin config flag has been added to enable this feature

sharedHost: true

Note: If the flag is not set no plugins will share a rpc server, keeping a 1 - 1 relationship between rpc client and server.

• Addition of pkg/cache to keep plugin host contexts for finding rpc servers in separate ignite processes.

[codecov]

Codecov Report

Merging #3238 (17ef117) into main (e2cc76c) will increase coverage by 0.16%.
The diff coverage is 67.56%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3238      +/-   ##
==========================================
+ Coverage   19.90%   20.06%   +0.16%     
==========================================
  Files         384      385       +1     
  Lines       31003    31102      +99     
==========================================
+ Hits         6170     6240      +70     
- Misses      24245    24264      +19     
- Partials      588      598      +10     

Impacted Files	Coverage Δ
ignite/cmd/plugin.go	27.84% <0.00%> (ø)
ignite/services/plugin/interface.go	43.58% <ø> (ø)
ignite/services/plugin/cache.go	57.14% <57.14%> (ø)
ignite/services/plugin/plugin.go	71.76% <78.43%> (+2.13%)	⬆️
ignite/services/plugin/scaffold.go	56.75% <100.00%> (+2.47%)	⬆️
ignite/pkg/env/env.go	38.46% <0.00%> (+15.38%)	⬆️

[tbruyelle]

@joshLong145 I refactored a little bit the cache part :

• use .ignite/plugins as root dir
• remove usage of intermediary ConfigContext (the tests are passing, so I assume I solved the problem you had with the net.Addr, but maybe you should check again please)
• ReadPluginConfCache returns a ReattachConfig instead of filling the one in paramters.
• missing err check when calling cache.Put

See b8fea7d

Tell me if it's OK for you, if yes I will approve the PR 👍

I also made the cache functions private 66e9463

[joshLong145]

@joshLong145 I refactored a little bit the cache part :

• use .ignite/plugins as root dir
• remove usage of intermediary ConfigContext (the tests are passing, so I assume I solved the problem you had with the net.Addr, but maybe you should check again please)
• ReadPluginConfCache returns a ReattachConfig instead of filling the one in paramters.
• missing err check when calling cache.Put

See b8fea7d

Tell me if it's OK for you, if yes I will approve the PR 👍

I also made the cache functions private 66e9463

@tbruyelle
These changes look good to me. Verified they don't regress functionality with the changes to the plugin cache.

[tbruyelle]

Thanks for this feature @joshLong145 , will be useful for sure !