Support conda environment files as lockfiles

Hello there,

`osv-scanner` currently does not support [conda lockfiles](https://google.github.io/osv-scanner/supported-languages-and-lockfiles/).

Conda lockfiles, called "environment" files, can come at least in 2 different formats:
```
$ conda list -e

# This file may be used to create an environment using:
# $ conda create --name --file
# platform: linux-64
_libgcc_mutex=0.1=main
_openmp_mutex=5.1=1_gnu
argparse=1.4.0=pypi_0
blinker=1.8.2=pypi_0
bloodhound=1.7.2=pypi_0
bzip2=1.0.8=h5eee18b_6
ca-certificates=2024.7.2=h06a4308_0
certifi=2024.7.4=pypi_0
cffi=1.16.0=pypi_0
charset-normalizer=3.3.2=pypi_0
click=8.1.7=pypi_0
cryptography=43.0.0=pypi_0
dnspython=2.6.1=pypi_0
dsinternals=1.2.4=pypi_0
expat=2.6.2=h6a678d5_0
flask=3.0.3=pypi_0
future=1.0.0=pypi_0
idna=3.7=pypi_0
impacket=0.11.0=pypi_0
itsdangerous=2.2.0=pypi_0
jinja2=3.1.4=pypi_0
ld_impl_linux-64=2.38=h1181459_1
ldap3=2.9.1=pypi_0
ldapdomaindump=0.9.4=pypi_0
libffi=3.4.4=h6a678d5_1
libgcc-ng=11.2.0=h1234567_1
libgomp=11.2.0=h1234567_1
libstdcxx-ng=11.2.0=h1234567_1
libuuid=1.41.5=h5eee18b_0
markupsafe=2.1.5=pypi_0
ncurses=6.4=h6a678d5_0
openssl=3.0.14=h5eee18b_0
pip=24.0=py312h06a4308_0
pyasn1=0.6.0=pypi_0
pycparser=2.22=pypi_0
pycryptodome=3.20.0=pypi_0
pycryptodomex=3.20.0=pypi_0
pyopenssl=24.2.1=pypi_0
python=3.12.4=h5148396_1
readline=8.2=h5eee18b_0
requests=2.32.3=pypi_0
setuptools=69.5.1=py312h06a4308_0
six=1.16.0=pypi_0
sqlite=3.45.3=h5eee18b_0
tk=8.6.14=h39e8969_0
tzdata=2024a=h04d1e81_0
urllib3=2.2.2=pypi_0
webscreenshot=2.94=pypi_0
werkzeug=3.0.3=pypi_0
wheel=0.43.0=py312h06a4308_0
xz=5.4.6=h5eee18b_1
zlib=1.2.13=h5eee18b_1
```

```
$ conda env export

name: condaenvtest
channels:
- defaults
dependencies:
- _libgcc_mutex=0.1=main
- _openmp_mutex=5.1=1_gnu
- bzip2=1.0.8=h5eee18b_6
- ca-certificates=2024.7.2=h06a4308_0
- expat=2.6.2=h6a678d5_0
- ld_impl_linux-64=2.38=h1181459_1
- libffi=3.4.4=h6a678d5_1
- libgcc-ng=11.2.0=h1234567_1
- libgomp=11.2.0=h1234567_1
- libstdcxx-ng=11.2.0=h1234567_1
- libuuid=1.41.5=h5eee18b_0
- ncurses=6.4=h6a678d5_0
- openssl=3.0.14=h5eee18b_0
- pip=24.0=py312h06a4308_0
- python=3.12.4=h5148396_1
- readline=8.2=h5eee18b_0
- setuptools=69.5.1=py312h06a4308_0
- sqlite=3.45.3=h5eee18b_0
- tk=8.6.14=h39e8969_0
- tzdata=2024a=h04d1e81_0
- wheel=0.43.0=py312h06a4308_0
- xz=5.4.6=h5eee18b_1
- zlib=1.2.13=h5eee18b_1
- pip:
- argparse==1.4.0
- blinker==1.8.2
- bloodhound==1.7.2
- certifi==2024.7.4
- cffi==1.16.0
- charset-normalizer==3.3.2
- click==8.1.7
- cryptography==43.0.0
- dnspython==2.6.1
- dsinternals==1.2.4
- flask==3.0.3
- future==1.0.0
- idna==3.7
- impacket==0.11.0
- itsdangerous==2.2.0
- jinja2==3.1.4
- ldap3==2.9.1
- ldapdomaindump==0.9.4
- markupsafe==2.1.5
- pyasn1==0.6.0
- pycparser==2.22
- pycryptodome==3.20.0
- pycryptodomex==3.20.0
- pyopenssl==24.2.1
- requests==2.32.3
- six==1.16.0
- urllib3==2.2.2
- webscreenshot==2.94
- werkzeug==3.0.3
prefix: /usr/share/miniconda/envs/condaenvtest
```
Cheers !