feat: add generate config loading

[katcipis]

Adds:

• Parsing of terramate.config.generate
• Hierarchical load of generate config

Integration on actual code generation (and check) will be done on a separate PR, should be considerably smaller since this is the core logic and the other functions will only get the loaded config as a parameter.

[codecov-commenter]

Codecov Report

Merging #186 (70988e2) into main (ece3a47) will increase coverage by 0.56%.
The diff coverage is 58.29%.

❗ Current head 70988e2 differs from pull request most recent head 1ea6cd3. Consider uploading reports for the commit 1ea6cd3 to get more accurate results

@@            Coverage Diff             @@
##             main     #186      +/-   ##
==========================================
+ Coverage   60.56%   61.13%   +0.56%     
==========================================
  Files          28       29       +1     
  Lines        4694     4914     +220     
==========================================
+ Hits         2843     3004     +161     
- Misses       1686     1738      +52     
- Partials      165      172       +7     

Flag	Coverage Δ
tests	61.13% <58.29%> (+0.56%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cmd/terramate/cli/cli.go	0.00% <0.00%> (ø)
init.go	39.13% <0.00%> (ø)
run/order.go	0.00% <0.00%> (ø)
run/run.go	0.00% <0.00%> (ø)
manager.go	60.79% <34.42%> (-6.97%)	⬇️
test/hcl.go	57.74% <44.82%> (-3.13%)	⬇️
stack/stack.go	77.77% <65.30%> (-11.59%)	⬇️
stack/loader.go	53.52% <72.72%> (-1.19%)	⬇️
hcl/hcl.go	78.89% <77.01%> (-0.66%)	⬇️
project/project.go	31.11% <85.71%> (-1.50%)	⬇️
... and 11 more

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[mariux]

hey @katcipis... can you give a short demo to me tomorrow about the changes? really interested how this works ... thanks a lot..

[i4ki]

lgtm

[i4ki]

nice =)

[katcipis]

hey @katcipis... can you give a short demo to me tomorrow about the changes? really interested how this works ... thanks a lot..

Not yet because this PR is the core logic but it is not integrated to the code generation itself, but integrating should be fast (but not done yet). After the follow up PR we are good for demo time (when I make changes on the cli level I always add some demo script, usually very simple but with some demo value =P).

[i4ki]

lgtm