Feat: Added default custom domain support, null safety improvements, and new types

[fern-api]

Changes

Added support for the following new and modified endpoints:

Status	Method	Endpoint	SDK Method
NEW	GET	/api/v2/custom-domains/default	client.customDomains.getDefault()
NEW	PATCH	/api/v2/custom-domains/default	client.customDomains.setDefault()
MODIFIED	POST	/api/v2/client-grants	client.clientGrants.create()
MODIFIED	GET	/api/v2/organizations/{id}/discovery-domains	client.organizations.discoveryDomains.list()
MODIFIED	GET	/api/v2/organizations/{id}/discovery-domains/{discovery_domain}	client.organizations.discoveryDomains.getByName()
MODIFIED	GET	/api/v2/organizations/{id}/discovery-domains/{discovery_domain_id}	client.organizations.discoveryDomains.get()

[codecov]

Codecov Report

❌ Patch coverage is 85.96491% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.06%. Comparing base (7985e09) to head (0610e60).

Files with missing lines	Patch %	Lines
...ement/api/resources/customDomains/client/Client.ts	85.71%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1312      +/-   ##
==========================================
- Coverage   89.07%   89.06%   -0.02%     
==========================================
  Files         382      382              
  Lines       17856    17904      +48     
  Branches     8804     8835      +31     
==========================================
+ Hits        15906    15946      +40     
- Misses       1946     1954       +8     
  Partials        4        4              

Flag	Coverage Δ
alltests	89.06% <85.96%> (-0.02%)	⬇️

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

Files with missing lines	Coverage Δ
...gement/api/resources/clientGrants/client/Client.ts	88.82% <ø> (ø)
...ations/resources/discoveryDomains/client/Client.ts	88.47% <ø> (ø)
src/management/api/types/types.ts	100.00% <100.00%> (ø)
...ement/api/resources/customDomains/client/Client.ts	87.58% <85.71%> (-0.44%)	⬇️

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